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
Gazetteer of the Persian Gulf, Oman and Central Arabia a valuable resource for the serious researcher. The gazetteer was digitised and made available online by the Qatar Digital Library in January 2015. Gazetteer of the Persian Gulf, Oman and Central Arabia The Gazetteer of the Persian Gulf, Oman and Central Arabia (nicknamed Lorimer) is a two-volume encyclopedia compiled by John Gordon Lorimer. The "Gazetteer" was published in secret by the British government in India in 1908 and 1915 and it served as a handbook for British diplomats in the Arabian Peninsula and Persia. The work was declassified in 1955 under the fifty-year rule, and was widely praised for its