What are one of the two rivers that forms Mesopotamia?

One of the two rivers that form Mesopotamia is the Tigris River. It flows from the Taurus Mountains in Turkey through Iraq, eventually joining the Euphrates River before emptying into the Persian Gulf. Together, these rivers created a fertile region known as the "Cradle of Civilization," where early human societies developed. The rich alluvial soil supported agriculture, leading to the rise of complex societies in ancient times.