River Delta/Systems
it provided annual flooding for farming and agriculture, and settling there helped raise domestic farm animals, which lead to a new form of food instead of becoming nomads.
great civilizations came out of settling at those place.
Persian, Babylonian, Aryian, etc came from the Tigris and Euphrates
Indus Civilizations (sorry, i am zoning on the Indian names) came from the Indus River
Nile came the great Egyptian Civilization that still exists today, and the list goes on and on
so its River Delta Systems
