Menmecho Lake is a mountain lake located in East Sikkim district in the state of Sikkim, India. It lies on the way to the Jelepla Pass and is situated at a distance of ahead of the Lake Tsomgo. It is the source of the river Rangpo chu, a tributary of the Teesta River. The waters of the lake are sourced by melting snow in summer, and the monsoon in the wet season.