Rivers are natural land formations. They haven't got any planned purpose apart from draining water from regions of higher altitude into regions of lower altitude, which they do all by themselves.
Mesopotamia has two rivers, the Tigris and the Euphrates.
The Tigris and Euphrates rivers
The Tigris and the Euphrates were the main rivers of the fertile crescent
Those two rivers are the Euphrates and Tigris.
Mesopotamia has the Euphrates and Tigris Rivers.
The Tigris and Euphrates rivers meet in Iraq.
The Tigris and Euphrates Rivers flow into the Persian Gulf.
The Tigris and Euphrates rivers flow into the Persian gulf
The Tigris and Euphrates rivers because they surround Ancient Mesopotamia.
The Tigris and the Euphrates Rivers.
Tigris and Euphrates Rivers are one of them
Tigris and Euphrates