The Huai River (Chinese: 淮河; pinyin: Huái Hé), formerly romanized as the Hwai, is a major river in China. It is located about midway between the Yellow River and Yangtze, the two longest rivers and largest drainage basins in China, and like them runs from west to east. Historically draining directly into the Yellow Sea, floods have changed the course of the river such that it now primarily discharges into the Yangtze. The Huai is notoriously vulnerable to flooding.
|Provinces||Henan, Anhui, Jiangsu|
|Cities||Xinyang, Fuyang, Lu'an, Huainan, Bengbu, Tianchang, Huai'an, Yangzhou|
|• location||Nanyang, Henan|
|• elevation||1,029 m (3,376 ft)|
|0 m (0 ft)|
|Length||1,110 km (690 mi)|
|Basin size||174,000 km2 (67,000 sq mi)|
|• average||1,616 m3/s (57,100 cu ft/s) Note, this is the main discharge into the Yangtze, 82.0% of the total water flow of all Huai waters.|
|Progression||Yangtze → East China Sea|
The Qinling–Huaihe Line, formed by the Huai River and the Qin Mountains, is sometimes regarded as the geographical dividing line between Northern and southern China. This line approximates the 0 °C (32 °F) January isotherm and the 800 millimeters (30 in) isohyet in China.
The Huai River is 1,110 kilometers (690 mi) long with a drainage area of 174,000 square kilometers (67,000 sq mi).
The Huai River originates in Tongbai Mountain in Henan province. It flows through southern Henan, northern Anhui, and northern Jiangsu where it pools into Lake Hongze. Nowadays the Huai River then runs southwards as the Sanhe River by way of the Gaoyou Lake and Shaobo Lake, emptying into the Yangtze River at Sanjiangying (三江营) near Yangzhou.
There is also a passage called the Huaihe Sea Entryway and Subei Irrigation Canal that passes Huai'an and empties into the sea at Biandan Port. A separate course runs north by way of the Huaimu River and Huai Shu River and connects the Huai River system with the Xinyi River (part of the Yishusi River system) which exits into the sea at Guanyun in Lianyungang.
Historically, the Huai River entered the Yellow Sea at Yunti Pass (modern day Yunti Village, in Huangwei Town of Xiangshui County) through a broad and level lower course. It was long used to irrigate the surrounding farmlands, and was the center of an extensive network of canals and tributaries.
|Hanyu Pinyin||Huái Hé|
Beginning in 1194, however, the Yellow River to the north repeatedly changed its course southwards to run into the Huai River. The resulting silting was so heavy that after the Yellow River changed back to its northerly course for the most recent time in 1897, the geography of the Huai River basin was changed significantly by the creation of new high lands, lakes, and the built-up silt of the Yellow River's historical southern course. As a result, water from the midsection of the river could not easily flow into the lower section, while water in the lower section could not find an outlet to the sea. The problem worsened in the Second World War, when the Nationalist government, in an attempt to check the pace of the Japanese invasion, flooded the lower Huai basin by opening the Yellow River's southern levee. The main stem of the Yellow River flowed through the levee breach for the next nine years, further disrupting the Huai river system.
The result of these changes was that water from the Huai River pooled up into Lake Hongze, and then ran southwards towards the Yangtze River. Major and minor floods occurred frequently, with the area suffering droughts in between floods. In the 450 years to 1950, the Huai River saw, on average, 94 major floods per century.
Attempts to solve the Huai River's problems have focused on building outlets for the Huai River into the Yangtze River and the sea. Currently, the major part of the river's flow enters the Yangtze River via Lake Hongze. The North Jiangsu Main Irrigation Canal also diverts some of its water along its old historical course to the sea, and is planned to be upgraded with a new parallel channel. Several former tributaries also carry some water to the sea.
There are many tributaries of the Huai River. There are 15 main tributaries cover an area of more than 2,000 square kilometers (770 sq mi) each, and 21 main tributaries have a catchment area larger than 1,000 square kilometers (390 sq mi). 
|North bank||South bank|
|Hong River (洪河)||You River (游河)|
|Ying River (潁河)||Shi River (浉河 [河流])|
|Xi Fei River (西淝河)||Zhu Gan River (竹竿河)|
|Guo River (涡河)||Zhai River (寨河)|
|Xin Bian River (新汴河)||Huang River (潢河)|
|Kui Sui River (奎濉河)||Bai Lu River (白露河)|
|Shiguan River (史灌河)|
|Pi He River (…)|
|Dong Fei River (东淝河)|
|Chi River (池河 [淮河])|
- "Main Rivers". National Conditions. China.org.cn. Archived from the original on March 13, 2012. Retrieved July 27, 2010.
- "Huai River". Encyclopædia Britannica. 2014. Retrieved 31 October 2014.
- Ma, Zhong. Evaluation of the Implementation of Water Pollution Prevention and Control Plans in China - The Case of Huai River Basin (PDF). Retrieved 10 October 2020.
- Elvin, Mark (2004). The Retreat of the Elephants: An Environmental History of China. Yale University Press. ISBN 9780300133530. Retrieved 11 October 2020.
- "淮河". Wikipedia. Retrieved 10 October 2020.