Chinese Er Hai or Erh Hai
Lake, western Yunnan province, China.
It lies in a deep basin at the foot of Mount Diancang between the upper Mekong rivers; it is about 30 mi (50 km) long and 6–10 mi (10–16 km) wide. The south of the basin has connections to eastern Yunnan and to {{link=Sichuan">Sichuan province and is on the main route southwest to Myanmar (Burma). The surrounding area was brought under Chinese control during the Yuan dynasty (late 13th century).