Taihu County is located in the southwest of Anhui Province, on the southern edge of Dabie Mountain, between 30 09' and 30 46' north latitude and between115 45' and1/6 30' east longitude. Poyang Lake lies between 28 22' north latitude and 29 45' east longitude. Dongting Lake is located in the north of Jiangxi Province, on the south bank of the middle and lower reaches of the Yangtze River, on the subtropical northern edge of China, between 28 30 ′ and 30 20 ′ north latitude and between110 40 ′ ~13/kloc-0 ′ east longitude. Hongze Lake is located in the northwest of Jiangsu Province, in the middle of Subei Plain. The main stream winds eastward from the Qinghai-Tibet Plateau, flows through Qinghai, Xizang Autonomous Region, Sichuan, Yunnan, Hubei, Hunan, Jiangxi, Anhui, Jiangsu, Shanghai and other provinces, autonomous regions and municipalities directly under the Central Government, and flows eastward into the Yellow River in the East China Sea in Shanghai, passing through Qinghai, Sichuan, Gansu, Ningxia, Inner Mongolia, Shanxi, Shaanxi, Henan and Shandong. The eastern end of Heilongjiang Province joins the Bohai Sea in Kenli County, Shandong Province, and Fuyuan in the east, where Wusuli River joins Heilongjiang (east longitude 135 05'), and the western end reaches the west of Dalinhetou in the north of Daxing 'anling (east longitude121kloc-0/'), starting from Heilongjiang in the north of Mohe. The Pearl River is a big river in the south of China, which flows through Yunnan, Guizhou, Guangxi, Guangdong, Hunan, Jiangxi and other provinces (regions) and the northeast of the Socialist Republic of Vietnam, with a drainage area of 453,690 square kilometers, including 442 100 square kilometers in China.