Hai-Luan | The Hai River, which flows through Beijing and Tianjin before it discharges into the Bohai Sea which adjoins the Yellow Sea is 1329 km in length. | 29.75* | 350 | The economic and ecological implications stemming from the flood control of Hai have taken a toll on Beijing and Tianjin. Hai has made considerable progress in improving quality even though it is considered to be the river with the worst category of pollution |
Northwest |
| 120.49 | 5270 |
|