Qaidam (chĪ-däm) [key] or Tsaidam tsĪˈdäm, chĪ-däm, arid basin, c.350 mi (560 km) long and c.100 mi (160 km) wide, between two branches of the Kunlun range, central Qinghai prov., W China. A salt marsh occupies most of the area. Oil fields and refineries are found in W Qaidam, and iron ore is mined in the southern part.

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