The cradles of early civilizations were river valleys , such as the LOCATION@1 and Tigris valleys in LOCATION@2 , the MISC@1 valley in LOCATION@3 , the Indus valley in the MISC@2 subcontinent , and the LOCATION@4 and LOCATION@5 valleys in LOCATION@6 .

These civilizations are called river valley civilizations . They say LOCATION@6 began as city-states in the LOCATION@5 valley .
