Bóhǎi

Bohai County lay on the low plain of northern Shandong, named for the sea beyond its rivers and marshes. Established under the Tang, its seat moved west when the old site was troubled by saline soil. The county later served as the seat of Binzhou. In 1265 the Yuan official Yu Baobao rebuilt the county town south of the earlier Tang walls. Its position in the lower river country left the surrounding settlements exposed to changing watercourses and salt in the soil.