Yìjīn

Yijin was a fortified crossing on the plain south of the northern frontier. In 959 the Later Zhou recovered Yijin Pass from the Khitan and established Bazhou here. The county of Yijin later shared the prefectural seat, but was absorbed into Bazhou in the early Ming. The old pass recalls the time when this low, watery country stood close to the contested boundary between the Song and Liao states.