What was common in the economy of the southern interfluve and Egypt?

During the existence of the Egyptian and Sumerian civilizations, the basis of their activities was agriculture and cattle breeding, which was concentrated along large rivers.

In Egypt, along the Nile, and in the area between the rivers near the Tigris and Euphrates rivers.

Since most of the data areas were in hot and dry areas, they used water from rivers to irrigate their fields, which was transmitted over great distances using special canals.

The productivity of these places depended on the level of water spill of these rivers in spring.