Tongshan District (Tongshan County), formerly known as Pengcheng County, belongs to Xuzhou City, Jiangsu Province, and is named after Tongshan Island in Weishan Lake. It is adjacent to Weishan County and Zaozhuang City in Shandong Province in the north, Yongqiao District and Lingbi County in Suzhou City, Anhui Province in the south and southwest, Pizhou City and Suining County in the east, and Xiaoxian County, Fengxian County and Peixian County in the west. By the end of 2021, Tongshan District has an area of 1911.7 square kilometers and a permanent population of 1122200.

Tongshan District is located in the center of Huaihai Economic Zone. It has the reputation of "thoroughfare of five provinces" in ancient times, and now has the convenience of "five connections" of highways, railways, waterways, aviation and pipelines. Xuzhou High-tech Zone in Tongshan District is the first state-level high-tech zone in northern Jiangsu. There are tourist attractions such as Chu River, Xuanshui Lake, Lvliang Mountain Scenic Spot, Bajian Spring, Pengzu's hometown, Han Tombs at King of Chu Mountain, Thousand Buddha Cave, Jiaoshan Lake in Xuzhou, as well as historical celebrities such as Peng Zu, Liu Yu, Li Yu, Zhang Zhao, etc. It is the industrial and commercial, technological innovation and foreign trade center of Xuzhou, one of the core areas of Xuzhou's megacities, and also the innovative pilot area of Jiangsu Province.

In 2021, Tongshan District will achieve a gross regional product of 128.11 billion yuan, and its total volume will remain the first in northern Jiangsu; The total fiscal revenue is 8.97 billion yuan; The retail sales of consumer goods totaled 46.54 billion yuan. In 2022, the comprehensive strength of Tongshan District ranks 27th among the top 100 regions in China and 26th among the top 100 regions with investment potential in China.