Bongju

Pongju, later called Pongsan, lies in the inland country of Hwanghae near the Chaeryŏng plain. Under Mongol rule a regional military office was established here; Koryŏ later recovered the district and appointed a defence commissioner in 1285. The pass at Tongsŏn was an important military position on the eastern approach. In 1413 the Joseon administration renamed the county Pongsan.