Tista or Teesta is the largest river of Sikkim.
its way through Sikkim the Teesta river divides the states into two parts.
Teesta can be called as Ganga of the state of Sikkim as most of the Sikkim's
settlements are found along the banks of this river. The Teesta comes out
as a snout from the Zemu glacier above Lachen Gompha. It is
joined by the Lhonk stream from the north. Another stream
Lachung rises from Pauhunri and meets the Teesta at Chumthang. Rangit
is another principle river.