Lake Paiku (or Peiku) -- in ***** Paiku-Tso or -Tsho—is at 4,591 meters (15,070 ft) elevation on the *****an Plateau at 28°55′N 85°35′E / 28.917°N 85.583°E / 28.917; 85.583, 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). Streams fed by glaciers cascade to the valley floor but most sink into alluvial deposits before reaching the lake.