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
National Democratic Front for the Liberation of Oman and the Arabian Gulf unable to defeat the insurgency. In 1971, having suffered military setbacks, NDFLOAG began seeking cooperation with PFLOAG. In December 1971 NDFLOAG and PFLOAG merged, forming the Popular Front for the Liberation of Oman and the Arab Gulf, although the two groups retained separate organizational structures. National Democratic Front for the Liberation of Oman and the Arabian Gulf The National Democratic Front for the Liberation of Oman and the Arabian Gulf (, abbreviated NDFLOAG) was a guerrilla movement in the Arabian peninsula. NDFLOAG was formed in Iraq in 1969 by Omani students (primarily studying in Kuwait) and other emigrees. Some had