Haihe (Haihe River System) is the largest water system in northern China, one of the seven major rivers in China. Haihe is located in the Beijing, Tianjin and Shanghai area, forming the Haihe River basin. The lower reaches after the Tianjin confluence is called Haihe River. The upper reaches include five tributaries, namely Chaobai River, Yongding River, Daqing River, Ziya River, and South Canal (the Wei River in the Haihe River Basin). Among them, the Chaobai River is complicated in nature: part of the introduction of Beijing, part of the injection of Haihe River in Tianjin, part of the introduction of the Chaobai New River into the Bohai Sea, authoritative information as one of the five tributaries of the Haihe River. There is also a small tributary, the North Canal (between the Chaobai River and Yongding River). The Haihe dry current, also known as the Luohe River, starts from Tianjin Jingang Bridge to Dagukou into Bohai Bay. The Weihe River is the source, the total length is 1,050 kilometers, and the dry current is 76 kilometers below the Jingang Bridge, and the river is narrow and curved. Haihe Basin is east of the Bohai Sea, south of the Yellow River, west of Taihang Mountain, north of the southern edge of the Inner Mongolia Plateau, across the eight provinces (urban areas) of Beijing, Tianjin, Shanghai, Jin, Lu, Yu, Liao, Inner Mongolia, the total area of the basin is 26.5 10,000 square kilometers, accounting for 3.3% of the total area of the country, of which the mountainous area accounts for about 54.1%, and the plain accounts for 45.9%. With a population of more than 70 million people, and1.8 million mu of arable land. The Haihe River system has been flooded frequently in history. After the establishment of the People's Republic of China, the "radical control of the Haihe River" was implemented, and the water problem was treated to a certain extent. Difference: The western water system of Bohai Bay includes the Haihe River, the Weihe River and the Tuhai Macheu River. And the canal (in the east of the Chaobaixin River), Chaobaixin River (only a part of the Chaobai River water) and other small rivers.