Shatt al-Arab, River confluence in Basra Governorate, Iraq
The Shatt al-Arab is a river in Basra Governorate in Iraq and Khuzestan Province in Iran, running from where the Tigris and Euphrates meet to the Persian Gulf. The water grows increasingly salty as it flows through flat marshland and urban shorelines.
During the 16th century the Ottoman and Safavid empires fought over control of this waterway until both sides signed a treaty in 1639. Later conflicts brought further border shifts and changes in use.
The name comes from the Arabic term for riverbank and points to the dense palm groves that shaped these shorelines for centuries and defined daily life for those living nearby. Today boats still move through the water in places, while new trees are planted along some stretches.
The water carries heavy sediment loads, making depth constantly shift and allowing only smaller vessels to pass through. Some shoreline areas are accessible while others remain restricted by military zones.
The border between both countries runs through the middle of the channel in places, meaning fishermen sometimes change nations without stepping ashore. Some sections mix fresh and salt water so heavily that certain fish species exist only there.
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