Ri Bhoi district's history page records its formation from East Khasi Hills
Background
Ri Bhoi district's official history page states that the district was created by upgrading a former Civil Sub-Division, carved out of the erstwhile East Khasi Hills district. Its headquarters is Nongpoh. The district has an area of 2,448 sq km, excluding areas under dispute between Assam and Meghalaya. It is bounded by the Kamrup, Morigoan and Nagoan districts of Assam to the north, Karbi Anglong district of Assam to the east, East Khasi Hills and West Khasi Hills districts to the south, and West Khasi district to the west. The page notes that the Bhois, the main inhabitants, are a sub-group of the Khasi tribe and follow the matrilineal system.