What is the relationship between life and living by water in production?

The distribution of many agricultural areas in the world, especially in arid areas, is often along the river, and river water, as the main irrigation water, makes up for the shortage of local precipitation; Many cities in the world are especially located in arid areas and southern China. Rivers in arid areas played the role of water supply, while rivers in southern China often played the role of shipping, especially in ancient times. The four ancient civilizations in the world are all distributed along the river, and the earliest civilization belongs to river civilization.