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
Christians in the Persian Gulf Christians in the Persian Gulf Christians reached the shores of the Persian Gulf by the beginning of the fourth century. According to the "Chronicle of Seert", Bishop David of Perat d'Maishan was present at the Council of Seleucia-Ctesiphon, around 325, and sailed as far as India. Gregory Bar Hebraeus, "Chron. Eccles", 2.10 (v. 3, col. 28) indicates that David had earlier ordained one of the other bishops present at the Council. The monk Jonah is said to have established a monastery in the Persian Gulf "on the shores of the black island" in the middle of the fourth century. A