River River in SW Asia, rising in southern Turkey and flowing south-east through Baghdad to meet the River Euphrates in SE Iraq, from where the two rivers flow on into the Persian Gulf.

river of eastern Mesopotamia, also called Idiglat.

an Asian river; a tributary of the Euphrates River

One of the two major rivers that forms the "cradle of civilization."

The Tigris is the eastern member of the pair of great rivers that define Mesopotamia, along with the Euphrates, which flows from the mountains of Anatolia through Iraq.