2. The altitude ranges from 20m to1500m. Mountains account for 70% of the total area of the basin, mostly distributed in the northern and central parts of the basin, generally above 500m; Hills account for 25% of the total basin area, mainly distributed in Meijiang basin and other major and tributary basins, generally below 200 meters above sea level; The plain accounts for 5% of the total basin area, mainly distributed in the lower reaches of the Hanjiang River Delta, generally below 20m above sea level.

3. The Hanjiang River Basin covers 22 cities and counties in Guangdong, Fujian and Jiangxi provinces, with a basin area of 30 1 12 square kilometers. The upper reaches of Hanjiang River are formed by the confluence of Meijiang River and Tingjiang River. Meijiang, as the mainstream, originates from Shangfeng, Zijin County, Guangdong Province, flows from southwest to northeast through Wuhua, Xingning, Meixian, Meizhou and Dabu counties in Guangdong Province, and joins Tingjiang at Sanheba.

Tingjiang River originates from Laijiashan, Ninghua County, Fujian Province, and flows from north to south through Changting, Wuping, Shanghang and Yongding counties in Fujian Province and dapu county in Guangdong Province. Meijiang River joins Tingjiang River and is called Hanjiang River. It flows from north to south through Fengshun, Chaoan and other counties in Guangdong Province, enters the Hanjiang River Delta river network area in Chaozhou City, and flows into the South China Sea through Shantou City in three streams: east, west and north. With Meijiang as the source, the main stream is 470 kilometers long.