River, Liaoning province and Inner Mongolia autonomous region, China. The East Liao rises in the mountains of Jilin province and the West Liao in southeastern Inner Mongolia. They merge and flow southwest as the Liao to empty into the Gulf of Liaodong, after a course of 836 mi (1,345 km). The river's drainage basin occupies 83,000 sq mi (215,000 sq km). It is navigable by small boats for about 400 mi (645 km) from its mouth
(907-1125) Dynasty formed by the nomadic Khitan tribes in much of present-day Manchuria, Mongolia, and the northeastern corner of China proper. The Chinese portion of the empire was governed on the Tang pattern, while the northern part was set up on a tribal basis. After the establishment of the Song dynasty (960-1279), the Liao carried out a border war for control of northern China. Eventually the Song agreed to pay the Liao an annual tribute. The Juchen, former subjects of the Liao, destroyed the dynasty in 1125 but adopted most of its governmental system. The name "Cathay" for China derives from Khitay, another name for the Khitan