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
Persian Gulf (horse) winners included the British Classic Race winners Parthia and Zabara, the leading stayer Zarathustra and the Champion Hurdler Persian War. Other good horses sired by Persian Gulf included Abadan (Cork and Orrery Stakes, Diadem Stakes), Agreement (Doncaster Cup), Arabian Night (second in the 1954 Epsom Derby), Persian Road (Ebor Handicap, sire of Dark Mirage), Queen of Sheba (Irish 1000 Guineas, Royal Hunt Cup), Rustam (Champagne Stakes) and Tamerlane (St James's Palace Stakes). He died in 1964 at the age of 24. Persian Gulf (horse) Persian Gulf (1940–1964) was a British Thoroughbred racehorse and sire, who raced during World War II.