Q. Which country forms the mouth of the "Euphrates River"?
Answer: Iraq
Notes: Iraq forms the mouth of the "Euphrates River". The Euphrates is the longest and one of the most historically important rivers of Western Asia. Together with the Tigris, it is one of the two defining rivers of Mesopotamia. Originating in the Armenian Highlands of eastern Turkey, the Euphrates flows through Syria and Iraq to join the Tigris in the Shatt al-Arab, which empties into the Persian Gulf.