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Mesopatamia??
There is no river that flows into the gulf west of Euphrates.
the river in southwest Asia is Euphrates!!!the main rivers of south-west Asia are Euphrates and Tigris. Tributaries of Euphrates are R.Khabur and R.Balikh and those of Tigris are the Great and the Lesser Zab, Diyala and Karun rivers.
The question as written is unanswerable. The Euphrates River is already west of the Iranian border, so any point west of the Euphrates is not part of Iran.If the question meant to ask: What desert lies directly west of the Euphrates River in the southwestern part of Iraq? -- The answer would be the "Arabian Desert". North of the Arabian Desert and west of the Euphrates River, in northwestern Iraq is the "Syrian desert".
The Tigris River is farther east, and the Euphrates river is further west.
The territory west of the Euphrates River.
The river in the West of Mesopotamia is called the Tigris R. The River in the East is called the Euphrates R.
That is the Euphrates.
The Tigris and Euphrates rivers.
It is the arabian desert
The longest body of water in the Middle East is the Red Sea.
Oaklahoma City is west of the Mississippi River.