Teesta River is a `trans-Himalayan` river flowing through the entire state of Sikkim. This river forms the boundary between Sikkim and West Bengal before merging with the Brahmaputra in Bangladesh as a tributary.

The river arises from the Cho Lhamu Lake at an average height of 5,330 metres (17,500 feet) above mean sea level in the majestic Himalayas. The Teesta River merges with the rivulets, which arise in the Thangu, Yumthang and Donkia-La ranges. It then traverses the Rangpo town where it forms a boundary line between Sikkim and West Bengal up to Teeata Bazaar. It is at the Teesta suspension Bridge where the river meets the main tributary Rangeet River. At this level, the river changes its direction and flows southwards in West Bengal. The river meets the plains at Sevoke and then moves towards Jalpaiguri and then to Rangpur district of Bangladesh before surrendering itself to the Brahmaputra at Fulcherry in Bangladesh. The total length of the river is about 315 km. Teesta River is famous for river rafting.

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