Shatt al Arab
The Shatt al Arab flows into the Persian Gulf. It is approx 190 km long and is fed by the Euphrates, Tigris, and Karun rivers.
The Shatt al Arab forms the boundary between Iraq and Iran and its ownership has frequently been disputed.
Attempts to expand sovereignty over the whole of the Shatt al Arab by Iraq was one of the issues which brought about the Iraq-Iran conflict.