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
Arab states of the Persian Gulf methods by Japanese scientists. According to the World Bank, most of these Arab states have been the world's most generous donors of aid as a share of GDP. Arab states of the Persian Gulf The Arab states of the Persian Gulf are the seven Arab states which border the Persian Gulf, namely Bahrain, Iraq, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates (UAE). This excludes the non-Arab state of Iran. All of these nations except Iraq are part of the Gulf Cooperation Council (GCC), and prefer to use the term "Arabian Gulf" rather than "Persian Gulf". Some states