The Tongwan City Ruins is located in Baichengzi (White City) Village, Hongdun Township at the north of Jingbian County. Because of its white walls, the locals named it Baichengzi (White City). Tongwan City was built in the 14th year of the reign of Emperor Yixi of the Eastern Jin Dynasty. It has a history of nearly a thousand years. Tongwan City is a historical capital city which was left in ruins by the Xiongnu. The entire city is made up of an inner city and outer city. The inner city is divided into the east city and west city. The scenery of the frontier here has a desolate sort of beauty.