Where do Hanshui River Basin and Jianghuai Huanghuai refer to?

Hanshui River Basin refers to the Hanjiang River Basin, with a basin area of174,300 square meters, spanning 79 counties and cities in Gansu, Shaanxi, Sichuan, Henan and Hubei provinces. There are six famous historical and cultural cities in Hanshui River Basin, which are evenly distributed from the source to the estuary, followed by Hanzhong, Nanyang, Xiangfan, Zhongxiang, Suizhou and Wuhan, second only to the Yellow River and the Yangtze River in China. Hanshui River Basin is located between the Yellow River and the Yangtze River, close to the most important natural boundary, the Qinling Huaihe River, which is a combination of the culture of the Yangtze River Basin in southern China and the culture of the Yellow River Basin in northern China.

Jianghuai refers to the Yangtze River and Huaihe River, while Huanghuai refers to the Yellow River and Huaihe River.