Ratey Chu

 Ratey Chu is a river in the Indian state of Sikkim that is the main source of water for the state capital, Gangtok. Ratey Chu emerges from the glacier-fed lake Tamze at an elevation of above sea level. Ratey Chu is tapped for drinking water at an elevation of . From this tapping point or water supply head work, water is transported for to the Selep Water Treatment Plant site.