Tilicho lake is one of the highest lakes in the World. It is 4,949 m high in the Annapurna range of the Himalayas in Manang district of Nepal. Another source lists Lake Tilicho as being 4,919 meters high (16,138 feet).Mountain lakes are known to geographers as tarns if they are caused by glacial activity. Tarns are found mostly in the upper reaches of the Himalaya, above 5,500 metres. Due to the extremely inhospitable surrounding terrain and the difficulties associated with reaching the area, this lake is rarely visited by outsiders.