Yúnnèi

Yunnei was an old prefecture near the Yellow River, northeast of the crossing at Dongsheng. Established by the Liao, it continued under the Jin and Yuan as one of the western prefectures linking the steppe to the river country. The early Ming abolished Yunnei in 1372 as it reorganised the frontier. Its history belongs to a district where successive peoples built towns and military posts along the river.