The Shatt al-Arab waterway constitutes a part of the border between which countries?
Shatt al-Arab canceled all plans. During the Mandate of Iraq (1920–32), the British advisors in Iraq were able to keep the waterway binational under the thalweg principle that worked in Europe: the dividing line was a line drawn between the deepest points along the stream bed. In 1937, Iran and Iraq signed a treaty that settled the dispute over control of the Shatt al-Arab. The 1937 treaty recognized the Iranian-Iraqi border as along the low-water mark on the eastern side of the Shatt al-Arab except at Abadan and Khorramshahr where the frontier ran along the "thalweg" (the deep water line) which gave
Shatt al-Arab Shatt al-Arab Shatt al-Arab (, "River of the Arabs") or Arvand Rud (, "Swift River") is a river of some 200 km (120 mi) in length, formed by the confluence of the Euphrates and the Tigris in the town of al-Qurnah in the Basra Governorate of southern Iraq. The southern end of the river constitutes the border between Iraq and Iran down to the mouth of the river as it discharges into the Persian Gulf. It varies in width from about at Basra to at its mouth. It is thought that the waterway formed relatively recently in geologic time, with