oldest known civilization on earth
The oldest known civilization was believed to have formed in  Mesopotamia near the Tigris and Euphrates rivers. This was believed  to have happened around 4000 B.C. and that â¦ is a fact! Answered. In Geology.he oldest known civilization was believed to have formed in  Mesopotamia near the Tigris and Euphrates rivers. This was believed  to have happened around 4000 B.C. and that â¦ is a fact! Answered. In Geology.