Lake Paiku (or Peiku) -- in Tibetan Paiku-Tso or -Tsho—is at 4,591 meters (15,070 ft) elevation on the Tibetan Plateau at (28°55′N85°35′E), 18 km south of the Yarlung Tsangpo (Brahmaputra) River. The lake is 27 km (17 mi) long and 6 km (3.7 mi) wide at its narrowest. It is surrounded by mountains reaching 5,700 to 6,000 meters (19 to 20,000 ft).