evidence: The Shatt al-Arab (Arabic: شط العرب, lit. 'River of the Arabs'; Persian: اروندرود, romanized: Arvand Rud, lit. 'Swift River'[5]) is a river about 200 kilometres (120 mi) in length that is formed at the confluence of the Euphrates and Tigris rivers in the town of al-Qurnah in the Basra Governorate of southern Iraq. The southern end of the river constitutes the Iran–Iraq border down to its mouth, where it discharges into the Persian Gulf. The Shatt al-Arab varies in width from about 232 metres (761 ft) at Basra to 800 metres (2,600 ft) at its mouth. It is thought that the waterway formed relatively recently in geological time, with the Tigris and Euphrates originally emptying into the Persian Gulf via a channel further to the west. Kuwait's Bubiyan Island is part of the Shatt al-Arab delta.[1] [...] Dispute over the river occurred during the Ottoman-Safavid era, prior to the establishment of an independent Iraq in the 20th century. In the early 16th century, the Iranian Safavids gained most of what is present-day Iraq, including Shatt al-Arab. They later lost these territories to the expanding Ottomans following the Peace of Amasya (1555).[8] [...] - ^ "Shatt al Arab". Oxford Public International Law. Retrieved 23 April 2022.