It is Euphrates River. Refer to related question below for more information.
I think the two rivers that traverse the fertile crescent are the Tigres and the Euphrates.
The Tigris and the Euphrates were the main rivers of the fertile crescent
The Tigris and Euphrates rivers because they surround Ancient Mesopotamia.
Nile River, The Tigris River, and the Euphrates River. The four largest rivers are the Tigris, Euphrates, Nile, and Jordan.
The Jordan River, the Euphrates River, and the Tigris Rivers.
Mesopotamia has the Euphrates and Tigris Rivers.
Mesopotamia has two rivers, the Tigris and the Euphrates.
Tigris and Euphrates Rivers are one of them
Narmada and Tapi are only the rivers which fall in the Arabian sea
The Tigris and Euphrates Rivers flow into the Persian Gulf.
The two main rivers are the Tigris river and Euphrates river.
The Tigris river and The Euphrates river