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 at its narrowest, in the Strait of Hormuz. The waters are overall very shallow, with a maximum depth of and an average depth of .