Tista River: Brahmaputra Tributary Flowing Through Sikkim

Lifeline of Sikkim

The Tista River (Teesta) is a major tributary of the Brahmaputra that flows the length of Sikkim.

Course

• Source: Tista Khangse Glacier (7,000+ m) in North Sikkim.
• Flow: South through deep gorges — Chungthang, Dikchu, Singtam, Rangpo.
• Border: Forms Sikkim–West Bengal boundary at Rangpo.
• Confluence: Joins Brahmaputra (Jamuna) in Bangladesh (Chilmari).

Significance

• Water: Drinking, irrigation, hydropower (multiple dams: Teesta III, V, etc.).
• Biodiversity: Rhododendron forests, red panda, snow leopard (upper); mahseer fish.
• Culture: Sacred to Lepcha, Bhutia, Nepali communities.
• Risk: Glacial lake outburst floods (GLOFs)—e.g., 2023 South Lhonak Lake breach devastated Chungthang.

Tista = Sikkim's artery. Managing its power and peril defines the state's future.