Yangzhou city is high in the west and low in the east, with the hills and mountains in Yizheng city as the highest, and gradually inclines from west to east. Gaoyou City, Baoying County and Taizhou xinghua city are the lowest, which are shallow lakes. The highest peak in China is Datong Mountain in Yizheng City, with an altitude of 149.5 meters. The lowest point is located at the junction of Gaoyou City, Baoying County and Taizhou xinghua city, with an average elevation of 2m. The northern part of Yangzhou City and Yizheng City is hilly, the He Lixia area is east of the Beijing-Hangzhou Grand Canal, north of the Toarey Yang Canal, and the area along the river and lake is plain. There are Datong Mountain, Xiaotongshan Mountain and Nashan Mountain in the territory, and the main lakes are Baima Lake, baoying lake, gaoyou lake and Shaobo Lake. There are 80.5 kilometers of coastline along the river, including Yizheng, Jiangdu, Hanjiang and Guangling. The Beijing-Hangzhou Grand Canal runs through the hinterland, communicates with Baima Lake, baoying lake, gaoyou lake and Shaobo Lake from north to south, and flows into the Yangtze River, with a total length of143.3km.. Besides the Yangtze River and the Beijing-Hangzhou Grand Canal, the main rivers are Baoshe River, Datong River, Beichengzi River, Toarey Yang Canal and Xintongyang Canal.