Hong River Hongru River, Ru River
Map showing the Hong River and Huai River
Native name	洪河 (Chinese)
Location
Country	China
State	Henan, Anhui
Region	Northern China and Eastern China
Physical characteristics
Source
• location	Near Wugang, Henan province, China
Mouth	Huai River
• location	Near Funan County, Anhui Province, China
• coordinates	32°24′36″N 115°32′52″E / 32.4099°N 115.5477°E / 32.4099; 115.5477
Length	325.99 km (202.56 mi), Northwest-Southeast
Basin features
River system	Huai River watershed

Hong River is a major tributary river of Huai River system. Its source is on the western slope of Dengtaijia Peak near the border between the city of Wugang and Biyang County of Henan province. If flows for about 326 kilometres (203 mi) before meeting the Huai River near the provincial border between Henan and Anhui provinces. The lower section of Hong River is also called Hongru River (洪汝河), as it follows the lower course of a historical Ru River (汝水) that was artificially redirected during Yuan and Ming dynasties. Suya Lake on Hong River is the largest reservoir on the plain in China.