High Quality Content by WIKIPEDIA articles! The Xar Moron river is a river in Inner Mongolia, in northeast China. It flows through the grasslands of that region, forming a valley that is hospitable to both farming and herding. The valley was once home to the Khitan people. The Xar Moron is the source of the Xiliao River, which in turn is one of the headwaters of the Liao River. The musical instrument xiqin, the ancestor of China's huqin family of bowed string instruments, is believed to have originated here with the Khitans, who were formerly called Xi by the Chinese.