Afghanistan is landlocked, and the Wakhan Corridor in Badakhshan reaches China's Xinjiang

Background

The Food and Agriculture Organization's technical paper on fish and fisheries at higher altitudes records that Afghanistan is a landlocked country, nearly 75% of which is mountainous.
The same paper describes three great river basins. The Amu-Darya, also called the Oxus, forms the boundary with Tajikistan, Uzbekistan and Turkmenistan in the north. The Kabul lies in the northeast and enters Pakistan in the east where it has a confluence with the Indus. The Helmand lies in the southwest and ends in Iran in a desert lake immediately after crossing the border.
An Observer Research Foundation issue brief describes the Wakhan Corridor as a narrow strip of land in Afghanistan's Badakhshan province, protruding from its eastern border and connecting it to China's Xinjiang province, with Tajikistan to its north.
The BBC country profile gives the capital as Kabul and the languages as Pashto and Dari.
Those five neighbours named by the river basins, together with China across the Wakhan, make six land neighbours in all, and the country has no sea coast of its own.