The first Xia Dynasty capital Yangcheng was built west of Gaocheng Township on the Yin River under the sacred Mount Song.
Arising off the southwestern slopes of Mount Natsim (1289 ft.) and the eastern slopes of Mount Okshitkon (1104 ft.) and Mount Setkya (1232 ft.), the Yin River flows south past the town of Natmauk and various other villages, turning west at about latitude 20.07° N.
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