6 October 2026
Union Minister for Environment, Forest and Climate Change Bhupender Yadav led the Indian delegation at the UNFCCC's Pre-COP31 meetings, co-hosted by Australia, Fiji and Tuvalu.
Addressing the Leaders' Plenary in Fiji, he called for equal attention to adaptation, mitigation and means of implementation as the world moves towards COP31.
He said the principles of Equity and Common but Differentiated Responsibilities and Respective Capabilities must be upheld in letter and spirit, and that there cannot be a one-size-fits-all pathway to climate action.
India offered to share its coastal resilience and space-based expertise with its Pacific partners, citing the work of the Indian Space Research Organisation, the National Centre for Sustainable Coastal Management and the National Centre for Coastal Research.
The Minister listed Indian expertise in coastal vulnerability assessment, shoreline change mapping, marine spatial plans, integrated coastal management plans and the Blue Economy, and in shoreline monitoring, inundation assessment, cyclone early warning and climate-risk assessment using Earth-observation capabilities.
Referring to his visit to Tuvalu, he said the Tuvalu Coastal Adaptation Project showed how the provision of means of implementation translates into resilience on the ground.
Pre-COP is a preparatory meeting held a few weeks before the annual UN Climate Change Conference, which this year will be held in Antalya, Türkiye, in November.
Pre-COP31 co-hosts:
Australia, Fiji and Tuvalu
COP31 venue:
Antalya, Türkiye
COP31 month:
November
Indian bodies named:
ISRO, NCSCM, NCCR
Why it matters for exams: The venue of COP31, the Pre-COP hosts and the CBDR-RC principle are frequently asked environment questions.
Kerala PSCUPSC
In plain words
Pre-COP Pre-Conference of the Parties meeting — A preparatory ministerial meeting held a few weeks before the annual UN Climate Change Conference.
CBDR-RC Common but Differentiated Responsibilities and Respective Capabilities — The climate negotiation principle that all countries must act but their obligations differ with their historical responsibility and capacity.
UNFCCC United Nations Framework Convention on Climate Change — The 1992 treaty under which the annual climate conferences are held.
Means of implementation Means of implementation — In climate talks, the finance, technology transfer and capacity building that developing countries need to deliver climate action.
NCSCM National Centre for Sustainable Coastal Management — A centre under the Ministry of Environment, Forest and Climate Change working on coastal zone management.
Background
The Government of India launched Project Tiger in 1973 as an ambitious, holistic conservation project.
It began with 9 reserves covering 18,278 km2 and grew to 53 reserves spread across 75,796 km2, as stated in the All India Tiger Estimation release.
The first phase focused on enacting the Wildlife Protection Act and establishing protected areas for tigers.
The detailed All India Tiger Estimation report gives the average number as 3682 tigers, an annual growth rate of 6.1% per annum.
The National Tiger Conservation Authority was involved in the release.
Launched:
1973
Initial reserves:
9 covering 18,278 km2
Reserves in the release:
53 across 75,796 km2
Average tiger number:
3682
Annual growth:
6.1% per annum
Why it matters for exams: Project Tiger's start year, its first-phase focus and the NTCA are recurring environment questions.
Kerala PSCUPSC
In plain words
NTCA National Tiger Conservation Authority — The authority that works on tiger conservation.
Background
The Intergovernmental Panel on Climate Change (IPCC) provides regular assessments of the scientific basis of climate change.
The assessments cover impacts, future risks, and options for adaptation and mitigation.
It was created in 1988 by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP).
Its objective is to give governments at all levels scientific information they can use to develop climate policies.
IPCC reports are also a key input into international climate change negotiations.
Created by:
WMO and UNEP
Year created:
1988
Why it matters for exams: Which bodies created the IPCC is a staple environment and institutions question.
Kerala PSCUPSC
In plain words
Mitigation Action to reduce climate change — Mitigation and adaptation are the two kinds of response the IPCC assesses.
Background
Kanchenjunga is the world's third highest mountain, at 8,586 metres (28,169 feet).
It lies in the eastern Himalayas on the international boundary between Sikkim, an Indian state, and eastern Nepal.
Four glaciers flow from its ridges: Zemu, Talung, Yalung and Kanchenjunga.
Its name is interpreted in Sikkim as the 'Five Treasuries of the Great Snow'.
It links the geography of Nepal and India directly.
Height:
8,586 metres
World rank:
third highest
Indian state on its boundary:
Sikkim
Why it matters for exams: Peak heights, rankings and border states are standard Geography recall.
Kerala PSCUPSC
Background
Nepal recorded a net surplus of Rs18.76 billion from electricity trade in fiscal 2025-26.
Exports earned Rs29.32 billion, up from Rs17.45 billion the year before (a rise of about 68 percent), while imports fell 18.29 percent to Rs10.55 billion.
Nepal sold power to India through the Indian Energy Exchange and NTPC Vidyut Vyapar Nigam, and to Bangladesh under a trilateral power-trade arrangement.
The Nepal Electricity Authority's figures show imports from India fell as hydropower, especially in the monsoon, met more of domestic demand.
Net surplus:
Rs18.76 billion
Exports:
Rs29.32 billion
Imports:
Rs10.55 billion
Previous-year exports:
Rs17.45 billion
Why it matters for exams: Hydropower trade ties Nepal's economy to India and Bangladesh; a common question on South Asian energy links.
Kerala PSCUPSC
In plain words
NEA Nepal Electricity Authority — Nepal's state power utility.
6 October 2026
An avalanche struck the Himlung Himal base camp in Manang district on Sunday, 27 September 2026.
At least 10 climbers and support staff were reported missing.
Himlung Himal is 7,126 metres high and lies near the Tibet border.
Heavy snowfall and a weather warning had led authorities to caution climbers and trekkers to suspend outdoor activities.
Bad weather delayed helicopter rescue.
Peak height:
7,126 metres
Missing:
at least 10
District:
Manang
Why it matters for exams: Mountain hazards and Himalayan geography are common Geography/Disaster topics.
Kerala PSCUPSC
In plain words
Avalanche Avalanche — A rapid flow of snow down a slope.
6 October 2026
The Commission for Air Quality Management (CAQM) has issued an order mandating expansion of Pan-Tilt-Zoom (PTZ) cameras at industries in the National Capital Region and adjoining areas. The cameras are for real-time monitoring of fuel use and compliance. They are to cover fuel storage areas, fuel charging points and gas meters. Industries are to install the additional cameras by 31.10.2026, and State Pollution Control Boards and the DPCC are to submit a status report on implementation by 01.11.2026. Real-time video feeds are to be streamed to the servers of the Central Pollution Control Board, State Pollution Control Boards and the Delhi Pollution Control Committee.
Installation deadline:
31.10.2026
Status report due:
01.11.2026
Camera type:
Pan-Tilt-Zoom (PTZ)
Why it matters for exams: Air-quality governance bodies and pollution-control measures are frequent environment questions.
Kerala PSCUPSC
In plain words
CAQM Commission for Air Quality Management — A statutory commission for air quality in the NCR and adjoining areas.
6 October 2026
Minister of Water Resources Li Guoying outlined the plan on 30 September 2026.
By 2030 the national water network is to cover 82% of China's territory.
Reservoir storage is to rise by 15 billion cubic meters, and 91% of key levees are to meet standards.
Irrigated farmland is to grow by 40 million mu, and tap water coverage in rural areas is to reach 98%.
A national water network dispatch center is to be set up.
The network is one of six prioritised networks of the 15th Five-Year Plan period (2026-2030).
Territorial coverage by 2030:
82%
Added reservoir storage:
15 billion cubic meters
Rural tap water coverage:
98%
Why it matters for exams: Water security and Five-Year Plans link economy, environment and governance questions.
UPSCSSC
In plain words
Five-Year Plan 15th Five-Year Plan — China's medium-term national development plan, here covering 2026-2030.
6 October 2026
Justice Devashis Baruah of the Gauhati High Court held, in a ruling reported on 21 September 2026, that the Forest Department must follow the Supreme Court's directions in Abdul Khalek when acting against forest occupants.
The case is Yunus Ali & 14 Ors. v. State of Assam & 8 Ors. (WP(C)/4258/2025).
The court held that notices issued in July 2025 over occupation of South Nambar Reserved Forest had become redundant in view of the Abdul Khalek directions.
In June 2026 a division bench of Chief Justice Ashutosh Kumar and Justice Arun Dev Choudhury upheld the eviction of Taungya settlers from reserved forests, with a 45-day extension.
Judge:
Justice Devashis Baruah
Case:
WP(C)/4258/2025
Notices held redundant:
Issued July 2025
Why it matters for exams: Due process in evictions and forest law are recurring themes in polity and environment questions.
Kerala PSCUPSC
In plain words
Taungya Taungya settlement — A temporary arrangement under which people were allowed to cultivate within forest land.
6 October 2026
The Assam Cabinet approved the Assam Sustainable Wetland and Integrated Fisheries Transformation (SWIFT) Project at a total cost of ₹796.88 crore.
It includes an Asian Development Bank loan of ₹637.504 crore and a state contribution of ₹159.376 crore.
The project will restore at least 102 derelict community beels, the floodplain wetlands of Assam.
ADB's own project page records approval of a US$71.90 million loan on 12 December 2025.
Its aim is to raise the income of beel fishermen through better management and diversified livelihoods.
Total cost:
₹796.88 crore
ADB loan:
₹637.504 crore
State contribution:
₹159.376 crore
Beels to be restored:
at least 102
Why it matters for exams: Wetlands, externally aided projects and fisheries policy are common in environment and economy questions.
Kerala PSCUPSC
In plain words
Beel Floodplain wetland — A beel is a floodplain wetland in Assam that supports fisheries.
ADB Asian Development Bank — A multilateral development bank financing projects in Asia.
6 October 2026
The ILO's preliminary assessment says the late-August flash floods in northern Nepal have disrupted jobs far beyond the flooded area.
The floods were triggered by a glacier collapse on the border with China.
More than 1,450 people were killed and 5,786 are still missing, according to the authorities.
About 21,400 employed people live within four kilometres of the flood footprint.
Informal, daily-wage and self-employed workers are at heightened risk; women may face lost pay and more unpaid care.
The ILO recommends immediate income support, employment-intensive reconstruction and skills development.
People killed:
more than 1,450
People still missing:
5,786
Workers within 4 km of flood footprint:
about 21,400
Why it matters for exams: Links a climate-driven disaster to labour markets and informal employment.
UPSC
In plain words
ILO International Labour Organization — The UN agency for labour standards and decent work.
Background
The district administration of Kaimur records that the district covers an area of about 340447 Hectares and has 17 police stations. Geographically, the district can be divided into two parts, a hilly area and a plain area. The hilly area comprises of Kaimur plateau. The plain area on the western side is flanked by the rivers The Karmanasha and the Durgawati, and the Kudra river lies on its eastern side. Buxar district of Bihar and Ghazipur district of Uttar Pradesh bound the district on the north, Garhwa district of Jharkhand lies to the south, Chandauli and Mirjapur districts of Uttar Pradesh lie to the west, and Rohtas district of Bihar lies to the east. The district has close linkage with the history of Shahabad, which was its parent district. The old district of Shahabad had four subdivisions of which Bhabua was one, and the present district of Kaimur has been formed from the whole of this Bhabua subdivision.
Area:
about 340447 Hectares
Hilly part:
Kaimur plateau
Rivers flanking the plain on the west:
Karmanasha and Durgawati
River on the eastern side:
Kudra
Parent district:
Shahabad (Bhabua subdivision)
Why it matters for exams: South Bihar is examined through its relief rather than its plains, and the Kaimur plateau with the Karmanasa and the Durgawati is the one block of upland that a Bihar geography question usually turns on.
Kerala PSCUPSC
In plain words
Plateau — An elevated tract of fairly level land standing above the surrounding country.
Background
The Bihar Forest Department records that the Vikramshila Gangetic Dolphin Sanctuary is located in Bhagalpur District of Bihar, and that the sanctuary is a 60 kilometers stretch of the Ganges River from Sultanganj to Kahalgaon in Bhagalpur district. It was notified in 1991 for the protection and conservation of the Gangetic dolphin. Being a riverine habitat, its boundary and expanse keep on changing due to the changing geomorphology of the Ganga. The sanctuary is named after the archaeological remains of Vikramshila University, once a famous centre of Buddhist learning across the world along with Nalanda during the Pala dynasty. Sultanganj at one end is an important religious centre, Bhagalpur is famous as silk city, and Kahalgaon at the other end is known for the super thermal power plant of NTPC. A release of the Ministry of Environment, Forest and Climate Change records that the Gangetic river dolphin has been designated as the National aquatic Animal of India, that it is listed in Schedule I of the Wild Life (Protection) Act, 1972, and that it is one of the 22 critically endangered species for which financial assistance is given to States under the centrally sponsored scheme for development of wildlife habitats. The same release names Vikramshila Dolphin Sanctuary, Bihar as an important habitat notified as a Protected Area.
District:
Bhagalpur
Stretch:
60 kilometers of the Ganges from Sultanganj to Kahalgaon
Notified:
1991
National Aquatic Animal of India:
Gangetic river dolphin
Legal protection:
Schedule I, Wild Life (Protection) Act, 1972
Why it matters for exams: The national aquatic animal, the Act and Schedule that protect it, and the one riverine sanctuary notified for it are a standard cluster in environment papers, and the sanctuary's name carries a history question with it.
Kerala PSCUPSC
In plain words
Schedule I — The schedule of the Wild Life (Protection) Act, 1972 that carries the highest degree of protection.
Geomorphology — The study of landforms and of the processes that shape them.
Background
West Champaran District was carved out of the old Champaran District in the year 1972 as a result of re-organization of the District in the state. It was formerly a subdivision of Saran District and then Champaran District, with Bettiah as its head quarters. The district administration records that Bettiah got its name from Baint (Cane) plants commonly found in the district. It also records that the name Champaran is a degenerate form of Champaka aranya, a name dating from the time when the tract was a forest of Champa (Magnolia) trees. On the 2011 Census figures the district publishes, Paschim Champaran ranks 9th in terms of population (39,35,042) and 1st in terms of area (5,228 sq.km.) in the state of Bihar. The same figures make it the 35th densely populated district in the state with 753 persons per sq.km. The district's place in the freedom movement rests on indigo cultivation: Raj Kumar Shukla, a raiyat and indigo cultivator of Champaran, carried the cultivators' case to Gandhiji, who came to Champaran in 1917 and began the Champaran Satyagraha Movement.
Carved out of old Champaran District:
1972
Headquarters:
Bettiah
Rank in Bihar by area (2011 Census):
1st, 5,228 sq.km.
Rank in Bihar by population (2011 Census):
9th, 39,35,042
Population density:
753 persons per sq.km (35th in the state)
Why it matters for exams: District re-organisation, place-name etymology and the Census rank of a district are standard one-mark material, and West Champaran is also the setting of the first satyagraha in India.
Kerala PSCUPSC
In plain words
Raiyat — A cultivator holding land directly under a landlord or the state in colonial revenue law.
Subdivision — An administrative unit below the district and above the block in the Indian revenue hierarchy.
Background
Assam's two main river systems both carry declared national waterways. National Waterway-2 (NW-2) runs on the Brahmaputra from Dhubri to Sadiya (891 km) in Assam and is an operational waterway for shipping and navigation. The navigable channel on NW-2 is maintained at 2.5 m depth between Dhubri and Neamati, 2.0 m depth between Neamati and Dibrugarh and 1.5 m depth between Dibrugarh and Oriumghat, by annual maintenance dredging. National Waterway-16 is the Barak river, where fairway development works were taken up for a navigable channel of the required depth and width between Silchar and Bhanga, a distance of 70 km. 20 National Waterways out of 111 are in the North Eastern Region (NER), and other Assam rivers also carry National Waterway numbers, among them the Subansiri (NW-95) and the Dhansiri or Chathe (NW-31), on which feasibility studies have been completed. Facilities built on NW-2 include a Multimodal terminal at Pandu with Low Level and High Level Jetty, a Ro-Ro terminal at Dhubri, and a Floating terminal at 11 locations on NW-2, among them Hatsingimari, Jogighopa, Tezpur, Silghat, Biswanathghat, Neamati, Bogibeel and Oriumghat. The Brahmaputra and the Barak waterways together map the physical shape of the state: the long Brahmaputra valley in the north and the shorter Barak valley in the south.
NW-2:
Brahmaputra, Dhubri to Sadiya, 891 km
NW-16:
Barak, Silchar to Bhanga, 70 km
National waterways in the North Eastern Region:
20 out of 111
Multimodal terminal:
Pandu
Why it matters for exams: National waterway numbers and their end points are standard objective questions, and NW-2 is the one that fixes the Brahmaputra's navigable stretch inside Assam.
Kerala PSCUPSC
In plain words
Ro-Ro Roll-on roll-off — A ferry service on which vehicles drive straight on and off, used to cross the Brahmaputra.
Maintenance dredging — Repeated removal of silt from a river bed to hold a channel at a declared depth.
Background
The National Tiger Conservation Authority's list of tiger reserves records four reserves in Assam: Manas, Kaziranga, Nameri and Orang. Manas carries a core area of 526.22 sq km and a buffer of 2,310.88 sq km, a total of 2,837.10 sq km, the largest of the four and a reserve in which the buffer is more than four times the core. Kaziranga is recorded with a core of 625.58 sq km and a buffer of 548.00 sq km, a total of 1,173.58 sq km, one of the two Assam reserves whose core is larger than its buffer. Nameri, the other, has a core of 320 sq km and a buffer of 144.00 sq km, a total of 464.00 sq km, and is the most core-dominated of the four. Orang has the smallest core of the four at 79.28 sq km, with a buffer of 413.18 sq km and a total of 492.46 sq km. The tiger reserve notification years the list gives are 2008 for Manas, 2007 for Kaziranga, 2000 for Nameri and 2016 for Orang. A core area is the inviolate heart of a reserve and the buffer around it is managed for coexistence, so the ratio between the two says a good deal about how a reserve is run.
Manas (core / buffer / total):
526.22 / 2,310.88 / 2,837.10 sq km
Kaziranga (core / buffer / total):
625.58 / 548.00 / 1,173.58 sq km
Nameri (core / buffer / total):
320 / 144.00 / 464.00 sq km
Orang (core / buffer / total):
79.28 / 413.18 / 492.46 sq km
Why it matters for exams: Examiners ask which states hold how many tiger reserves and which reserve is largest; Assam's set is unusual because one reserve is almost all buffer and another is core-heavy.
Kerala PSCUPSC
In plain words
Core area — The inviolate part of a tiger reserve, kept free of human settlement and resource use.
Buffer area — The belt around a core where regulated use and coexistence with people are allowed.
Background
The Kaziranga National Park is one of the oldest wildlife conservancy reserves of India. It was first notified in 1905 and constituted as Reserved Forest in 1908 with an area of 228.825 Sq. Km. It was specially established for the conservation and protection of the Greater One Horned Rhinoceros (Rhinoceros Unicornis), whose number was estimated at twenty pairs then. Kaziranga was declared a Game Sanctuary in 1916 and opened to visitors in 1938. It was declared a Wildlife Sanctuary in 1950, and notified as Kaziranga National Park in 1974 under the Wildlife (Protection) Act, 1972, with an area of 429.93 Sq. Km., which has since been extended to 899 Sq. Km. The Kaziranga National park was declared a Tiger Reserve in the year 2007, after which it draws financial support under CSS Project Tiger, which is under the National Tiger Conservation Authority (NTCA). The park has the river Brahmaputra on its north, and the Panbari Reserve Forest in Golaghat District is one of several notified forests in its vicinity.
First notified:
1905
Reserved Forest:
1908, 228.825 Sq. Km
Game Sanctuary:
1916
Wildlife Sanctuary:
1950
National Park:
1974, 429.93 Sq. Km (since extended to 899 Sq. Km)
Tiger Reserve:
2007
Why it matters for exams: The ladder of legal statuses a protected area climbs, and the Act under which a national park is notified, is one of the most repeated question shapes in both Kerala PSC and UPSC environment papers.
Kerala PSCUPSC
In plain words
Reserved Forest — A forest area notified by the state in which all activities are prohibited unless specifically permitted.
NTCA National Tiger Conservation Authority — The central statutory body that administers Project Tiger and the country's tiger reserves.
Background
The 2,880 MW Dibang Multipurpose Hydroelectric Project of Arunachal Pradesh is to come up near Munli village in Lower Dibang Valley District. The Ministry of Power records that the project will have a 278-metres-high dam, which would be the highest Concrete-Gravity Dam of India, and that it is planned to be constructed with the Roller Compacted Concrete (RCC) technique, making it the highest RCC Dam of the World. The project is to be built at a cost of more than Rs. 31,875 crores. It is designed to generate 11,223 million units of hydropower every year, to be fed into the Northern Grid, with a construction period of 108 months. The project is designed as an energy storage project, with flood moderation as one of the key objectives besides power generation; for flood moderation a capacity of 1,282.60 Million Cubic Meters is to be created by keeping the reservoir below the Full Reservoir Level in the monsoon. Arunachal Pradesh is to receive 12% free power from the project, together with an additional 1% free power for a Local Area Development Fund. The project is stated to have the potential of providing direct employment to 500 people during the construction phase and to 300 people during operation.
Installed capacity:
2,880 MW
Dam height and type:
278-metres-high Concrete-Gravity Dam
Annual generation:
11,223 million units
Free power to the state:
12% plus 1% for Local Area Development Fund
Why it matters for exams: Hydropower in the north-east is a recurring economy and infrastructure theme, and the free-power share of twelve per cent plus one per cent for local area development is the standard arrangement a candidate should be able to explain.
Kerala PSCUPSC
In plain words
RCC Roller Compacted Concrete — A dam-building technique in which stiff concrete is spread and compacted in layers by rollers.
Flood moderation — Holding back part of a river's monsoon flow in a reservoir so that the peak downstream is reduced.
Million units — A unit of electricity output; one million units equals one gigawatt-hour.
Background
The Changlang district administration describes Namdapha as a National Park and Tiger Reserve covering an area of 1985.23 square kilometres, lying within Changlang District in the state of Arunachal Pradesh. Mouling National Park, on the other side of the state, was established in 1982 and lies on the right bank of river Siang covering an area of 483 Sq. KM, as the Upper Siang district administration records. The national list of tiger reserves maintained by the National Tiger Conservation Authority records three reserves in Arunachal Pradesh: Namdapha, Pakke and Kamlang. For Namdapha the list gives a core of 1,807.82 sq km and a buffer of 245.00 sq km, a total of 2,052.82 sq km. Pakke is entered with a core of 683.45 sq km and a buffer of 515.00 sq km, a total of 1,198.45 sq km. Kamlang, the most recent of the three, is entered with a core of 671.00 sq km and a buffer of 112.00 sq km, a total of 783.00 sq km. Namdapha is described by the district administration as a true wilderness of lush green vegetation and pristine forests with diverse flora and fauna.
Namdapha, area given by the district administration:
1985.23 square kilometres
Mouling National Park:
Established 1982; 483 Sq. KM
Tiger reserves in the state:
Namdapha, Pakke, Kamlang
Pakke core and buffer:
683.45 and 515.00 sq km
Why it matters for exams: Protected-area questions are a standing part of environment papers, and Arunachal Pradesh is the one state where candidates routinely confuse the national park with the tiger reserve of the same name because the two figures differ.
Kerala PSCUPSC
In plain words
Core area — The strictly protected inner zone of a tiger reserve.
Buffer area — The outer zone of a tiger reserve where regulated human use is allowed.
NTCA National Tiger Conservation Authority — The statutory body that maintains the national list of tiger reserves.
Background
Several districts of Arunachal Pradesh are named not after towns but after the rivers that run through them, which makes the district map a rough map of the drainage. The West Kameng district administration records that the district's name is derived from the Kameng River, a tributary of the Brahmaputra that flows through it, and that the district accounts for 8.86% of the total area of the state. The East Siang district administration records that the name of the district is derived from the Mighty River Siang and gives the district an area of 3603 sq.km. Siang itself was later made a district: the district administration describes it as the 21st district of Arunachal Pradesh, created by bifurcating West Siang and East Siang districts. On the eastern side, Lohit district takes the name of the Lohit river and has an area of 3735 sq/km, with Tezu as the headquarter; Anjaw District was bifurcated from Lohit District on 16th February 2004, with its headquarter at Hawai at an altitude of 1296m above sea level, and Namsai district was carved out of Lohit District in 2014 and became the 18th District of the state. Kamle District was officially created on 15th December 2017, carved out from the Lower Subansiri and Upper Subansiri districts, which carry the name of the Subansiri.
West Kameng share of state area:
8.86%
East Siang area:
3603 sq.km.
Lohit area and headquarter:
3735 sq/km; Tezu
Anjaw headquarter altitude:
Hawai, 1296m
Why it matters for exams: A plain list of districts is easy to forget, but the river-to-district link lets a candidate place a headquarter such as Tezu or Hawai on a drainage map and answer both geography and administration questions from the same fact.
Kerala PSCUPSC
In plain words
Tributary — A river that flows into a larger river rather than into the sea.
Bifurcation — Splitting an existing district to create a new one.