Yíxīngzhōu

Yixing lay in the mountain country north of the Great Wall, on the approaches between Gubeikou and the grasslands. Under the Jin, the former town of Baitan was raised to Yixing County in 1203, within the territory of Xingzhou. The county continued under the Yuan, when the region belonged to the circuit of Shangdu. Its old town guarded a valley route through the northern hills.