Why is it all water? The south is called "river" and the north is called "river"?

This is a net article ① regional differences (south "river" and north "river"). For example, rivers in southern China are often called "rivers", such as Yangtze River, Pearl River, Qiantang River, Minjiang River, Nujiang River, Jinsha River, Lancang River, Yarlung Zangbo River, Lijiang River and Jiulong River. It can be seen that southerners are generally used to calling rivers "rivers". Rivers in the north are often called "rivers", such as Yellow River, Huaihe River, Weihe River, Jinghe River, Luohe River, Fenhe River, Qinghe River, Liaohe River, Yinma River, Qinhe River, Qaidam River, Tarim River and so on. It can be seen that northerners are used to calling rivers "rivers". People's division of river names is slightly different from the traditional north-south division. Tibet, Sichuan, Chongqing, Hubei, Jiangxi, Zhejiang and other places are often called "rivers" in the south and "rivers" in the north. This is the difference in naming habits between the north and the south. ② The differences in scale (big "river" and small "river") are roughly divided into regions, but nothing is absolute. When people name a river, they will also call it "Jiang" or "River" according to its size. Let's look at the exceptions: Nenjiang, Yalu, Heilongjiang, Songhua and Wusuli rivers in the north (Liuyang River and other rivers in the south). These rivers are called "rivers" in the north, and their similarities are length, flow and basin, and they are all large in scale. So in addition to the habit of naming the rivers in the area, people usually refer to some small rivers. (3) Cultural Differences between East and West Generally, China people call foreign rivers "rivers". The word "Jiang" is only used internally. ④ The conventional terms "Jiang" and "He" are just conventional terms, and there is no qualitative difference.