Tista
or Teesta is the largest river of Sikkim. Winding 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.