Gosaikunda, also spelled Gosainkunda, is an alpine freshwater oligotrophic lake in Nepal's Langtang National Park, located at an elevation of 4,380 m (14,370 ft) in the Rasuwa District with a surface area of 13.8 ha. Together with associated lakes, the Gosaikunda Lake complex is 1,030 ha in size and was designated a Ramsar site on 29 September 2007.

The Trishuli River is one of the major tributaries of the Narayani River basin in central Nepal. The river is formed by the merger of the Kyirong Tsangpo and the Lende Khola originating in Gyirong County of Tibet, which join together near the Rasuwa Gadhi on the Nepal–Tibet border. The valley of the river used to be the traditional trade route between the Kathmandu Valley and Tibet.