evidence: The 1974–1975 Shatt al-Arab conflict consisted of armed cross-border clashes between Iran and Iraq. It was a major escalation of the Shatt al-Arab dispute, which had begun in 1936 due to opposing territorial claims by both countries over the Shatt al-Arab, a transboundary river that runs partly along the Iran–Iraq border. The conflict took place between April 1974 and March 1975, and resulted in over 1,000 total casualties for both sides combined, though the Iranians eventually came to hold a strategic advantage over the Iraqis. Open hostilities formally came to an end with the 1975 Algiers Agreement, in which Iraq ceded around half of the border area containing the waterway in exchange for Iran's cessation of support for Iraqi Kurdish rebels. [...] Consequently, Iraq decided against continuing the conflict, and chose instead to make concessions to Tehran to end the Kurdish rebellion.[12][13] In the 1975 Algiers Agreement, Iraq made territorial concessions—including the Shatt al-Arab waterway—in exchange for normalized bilateral relations.[12] In return for Iraq recognizing that the frontier on the waterway ran along the entire thalweg as per Iran's argument, the latter ended its support for Iraqi Kurdish guerrillas.[12][16][17]