Gu Cheng Li

　　On the terrace west of the ancient city, about one li from where the Tumen River meets the Hongqi River, lies the eastern edge of the stone outcrop where the ancient city was built. The city walls were constructed from basalt and formed an irregular trapezoid. The area is now planted with paddy fields. The ancient city was relatively small and situated on a strategic terrace, with two rivers and the stone outcrop serving as natural barriers. It became a key passageway in and out of Changbai Mountain along the Tumen River, leading to speculation that the ancient city might have been a defensive fortress.

　　Today, Gu Cheng Li is the seat of Chongshan Town Government, located 80 kilometers from Helong. To the west lies the Hongqi River, to the north are the Dajunjian Mountain and Xiaojunjian Mountain, and to the south is the Tumen River bank, which includes a trading port. Across the river is the Sanchangli Port in North Korea, connected by the first international border bridge over the Tumen River — the Gu Cheng Li Bridge.