Rangeet or Rangit is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Teesta river

Teesta River

River Teesta or Tista is said to be the lifeline of the Indian state of Sikkim, flowing for almost the entire length of the state and carving out verdant Himalayan temperate and tropical river valleys. The emerald-coloured river then forms the border between Sikkim and West Bengal before joining...

, the largest river in the India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

n state

States and territories of India

India is a federal union of states comprising twenty-eight states and seven union territories. The states and territories are further subdivided into districts and so on.-List of states and territories:...

 of Sikkim

Sikkim

Sikkim is a landlocked Indian state nestled in the Himalayan mountains...

. The Rangeet river originates in the Himalayan mountains in West Sikkim

West Sikkim

West Sikkim is a district of theIndian state of Sikkim. Its capital is Geyzing, also known as Gyalshing. The district is a favourite with trekkers due to the high elevations. Other important towns include Pelling and Jorethang.-History:...

 district. A perennial river, it is fed by the melting snow of the Himalayas in early summer and the monsoon

Monsoon

Monsoon is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea...

 rains in July–August. It is popular among rafting

Rafting

Rafting or white water rafting is a challenging recreational outdoor activity using an inflatable raft to navigate a river or other bodies of water. This is usually done on white water or different degrees of rough water, in order to thrill and excite the raft passengers. The development of this...

 enthusiasts owing to its turbulent waters. The river flows past the towns of Jorethang

Jorethang

Jorethang is a major town in South Sikkim district in the Indian state of Sikkim. The town is situated at an altitude of about 300 m above sea level and has a temperate climate. Jorethang lies on the Rangeet River, a tributary of the River Teesta. Jorethang lies on the way to Pelling from...

, Pelling

Pelling

Pelling has a helipad ground though there is no regular air service. Helicopters can connect Pelling with Gangtok on request....

 and Legship

Legship

Legship is a small town in West Sikkim district in the Indian state of Sikkim. The Rangit Dam lies up stream, a dam which the people of Legship were partly responsible for.Another famous place of interest is the Kirateshwar Mahadev Temple....

. During its final few kilometres, it forms the boundary between West Bengal

West Bengal

West Bengal is a state in the eastern region of India and is the nation's fourth-most populous. It is also the seventh-most populous sub-national entity in the world, with over 91 million inhabitants. A major agricultural producer, West Bengal is the sixth-largest contributor to India's GDP...

 (Darjeeling District

Darjeeling district

Darjeeling District is the northernmost district of the state of West Bengal in eastern India in the foothills of the Himalayas. The district is famous for its beautiful hill stations and Darjeeling tea. Darjeeling is the district headquarters...

) and Sikkim. The tortuous river joins the Teesta river at Teesta Bazaar

Teesta Bazaar

Teesta Bazaar is a junction on National Highway 31A on the Siliguri-Gangtok highway in Darjeeling district of the state of West Bengal, India. Teesta Bazaar is on the right bank of Teesta River. Continuing upriver on the right bank from Siliguri, the road leads to Darjeeling. The river is crossed...

 on the border of West Bengal and Sikkim. The Rangeet river has a NHPC hydel power plant of 60 MW capacity in Sikkim.