Drangme Chhu
| Manas River | |
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Manas River on the Assam/Bhutan border.
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Manas River drainage basin
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| Native name | মানাহ নদী |
| Country | India, Bhutan, China |
| Basin | |
| River system | Brahmaputra River |
| Physical characteristics | |
| Length | 376 kilometres (234 mi) |
The Manas River (Pron: ˈmʌnəs; in Bhutan Drangme Chhu; in China Niamjang) is a transboundary river in the Himalayan foothills between southern Bhutan and India. It is named after Manasa, the serpent god in Hindu mythology. It is the largest river system of Bhutan, among its four major river systems; the other three are Amo Chu or Torsa, Wong Chu or Raidak, Mo Chu or Sankosh. It is met by three other major streams before it again debouches into India in western Assam. The total length of the river is 376 kilometres (234 mi), flows through Bhutan for 272 kilometres (169 mi) and then through Assam for 104 kilometres (65 mi) before it joins the mighty Brahmaputra River at Jogighopa. Another major tributary of the Manas, the Aie river joins it in Assam at Bangpari.
The river valley has two major reserve forest areas, namely the Royal Manas National Park (43,854 hectares (108,370 acres), established in 1966) in Bhutan and the contiguous Manas Wildlife Sanctuary (391,000 hectares (970,000 acres) in 1955 increased to 95,000 hectares (230,000 acres) in December 1985) encompassing Project Tiger reserve, an elephant teserve and a biosphere reserve, which constitutes a UNESCO World Heritage Site declared in December 1985.
The Manas River drains 41,350 square kilometres (15,970 sq mi) of eastern Bhutan and northeast India. It has three major branches: the Drangme Chhu, Mangde Chhu, and Bumthang Chhu that cover most of eastern Bhutan, with the Tongsa and Bumthang valleys also forming part of its catchment. The area drained in Bhutan territory is 18,300 km2 and is bound by the geographical coordinates 26°13′01″N 90°37′59″E / 26.217°N 90.633°E. A part of the main stem of the river rises in the southern Tibet before entering into India at Bumla pass at the northwestern corner of Arunachal Pradesh.
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