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Tongcheng, called "Guo Tong" in ancient times, is named after its land is suitable for planting tung trees. Located in the north of Anqing City, it is adjacent to Lujiang and Zongyang counties in the east, Qianshan County in the west, Shucheng County in the north and Huaining County and Anqing City in the south. The terrain is high in the northwest and low in the southeast, and the mountains, hills and plains are distributed step by step. It belongs to subtropical humid monsoon climate, with annual average temperature 15.9℃ and annual precipitation1241mm.

Tongcheng faces the river and tends to the Huaihe River. The river port and land post station have been busy since ancient times and are known as the "thoroughfare of seven provinces". National Highway 206, Hejiu Railway and Shanghai-Chengdu Expressway run through the whole territory, and Caizi Lake leads to the Yangtze River. It governs 1 national economic development zone, 1 provincial economic development zone, 12 towns and 3 streets, with a total area of 157 1 square kilometer. As of 20 1 1, the total population of the city is 755,000.