Persian Gulf flooding of the basin started 15,000 years ago due to rising sea levels of the Holocene glacial retreat. This inland sea of some is connected to the Gulf of Oman in the east by the Strait of Hormuz; and its western end is marked by the major river delta of the Shatt al-Arab, which carries the waters of the Euphrates and the Tigris. In Iran this is called "Arvand Rood", where "Rood" means "river". Its length is , with Iran covering most of the northern coast and Saudi Arabia most of the southern coast. The Persian Gulf is about wide
Territorial disputes in the Persian Gulf boundary were not disclosed. More recently, a dispute over the Dolphin Gas Project has renewed interest in the 1974 agreement. Earlier, the physical separation of the southern portion of Oman from its territory on the Musandam Peninsula was a source of friction between Oman and the various neighboring emirates that became the UAE in 1971. Differences over the disputed territory appeared to have subsided after the onset of the Iran–Iraq War in 1980. Territorial disputes in the Persian Gulf This article deals with territorial disputes between states of in and around the Persian Gulf in Southwestern Asia. These states include