Teesta River is a long river that rises in the Pauhunri Mountain of eastern Himalayas, flows through the Indian states of Sikkim and West Bengal and subsequently enters Bangladesh through Rangpur division. In Bangladesh, it falls into Brahmaputra River which after meeting some other major rivers of Bengal delta finally falls into the Bay of Bengal. It drains an area of . In India, it flows through Mangan District, Gangtok District, Pakyong District, Kalimpong district, Darjeeling District, Jalpaiguri District, Cooch Behar districts and the cities of Rangpo, Jalpaiguri and Mekhliganj. In Bangladesh, it flows through Lalmonirhat District, Rangpur District, Kurigram District and Gaibandha District. It joins the Brahmaputra River at Phulchhari Upazila in Bangladesh. of the river lies in India and in Bangladesh. Teesta is the largest river of Sikkim and second largest river of West Bengal after the Ganges. Course The Teesta River originates from Teesta Khangtse Glacier, west of Pahunri (or Teesta Kangse) glacier above , and flows southward through gorges and rapids in the Sikkim Himalaya. It is fed by streams from Tso Lhamo Lake, Gurudongmar Lake and rivulets arising in the Thangu Valley, Yumthang Valley of Flowers, Dikchu and Donkha mountain ranges. The river then flows past the towns of Chungthang, Singhik, Mangan, Dikchu, Makha where some major tributaries like Kanaka river joins and reaches Singtam, where it is spanned by scenic Indreni Bridge. Also in Singtam, a large tributary of Teesta called Ranikhola joins and then descends towards Bardang, Majitar, Mining where ot is spanned by Rangpo - Mining Teesta Bridge and reaches the city of Rangpo where Rangpo River, the second largest tributary of Teesta joins. From here river Teesta forms the border between Sikkim and West Bengal up to Teesta Bazaar via Melli. Just before the Teesta Bridge, where the roads from Kalimpong and Darjeeling join, the river is met by its largest tributary, the Rangeet River. At this point, it changes course southwards flowing into West Bengal. The river hits the plains at Sevoke, northeast of Siliguri, where it is spanned by the Coronation Bridge and Sevoke Railway Bridge linking the northeast states to the rest of India. After crossing Sevoke, the river is fed by some small tributaries like Chel Khola, Neora Khola, Leesh Khola etc, and than reaches Gajoldoba where there is Teesta Barrage. The river then flows through Jalpaiguri, where there is Jalpaiguri Teesta Bridge which links Northeastern States.