The Kosi Rising from peaks of Nepal, Tibet and Sikkim, the Kosi drains eastern Nepal and enters Saharsa district in Bihar via numerous channels. The channels flowing from north to south are received by the westernmost channel after it makes a bend to the east. It drains the area between Gosainthan and the Kanchenjunga in the Himalaya. The Arun-also Phungchu, in Tibetan-rises to the north of Gosainthan and runs south-west for 320 km to the south of the basin of Brahmaputra. It has a length of 730 km in India. It ends in the Ganga below Bhagalpur. Of the total
drained area of 86,900 sq km, 21,500 sq km is in India.
The Damodar It rises in the Chhotanagpur plateau near Tori in the Palamau district of Jharkhand. Its tributaries are the Garhi, Konar, Jamunia and the Barakar. It becomes a large river after its confluence with the Barakar. It joins theHooghly, after a course of nearly 541 km, a few kilometres below Calcutta. It drains 22,000 sq km of area.
The Brahmaputra System The Brahmaputra river, called Tsangpo in Tibet and Dihang in the Assam Himalaya, has its source at Tamchok Khambat Chorten in the Chemayungdung glacier which lies some 145 km from Parkha and near the source of the Karnali and the Sutlej. It is joined from the north by the Subansiri, Kameng, Jaibhorelli, Manas, Dhansiri (north) and Tisa. The Dhansiri (south), Burhi Dihing, Disang and Kopoli join the Brahmaputra from the south. It is met from the east by the Dibang, which drains the Himalaya east of Dihang, and the Luhit, flowing between Assam and Burma, near Sadiya. The Brahmaputra river system is one of the country's most important river systems that runs for 2,580 km (885 km in India) over 5,80,000 sq km (2,40,000 of them in India).
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