The word "Saudi" is derived from the element as-Suʻūdīyah in the Arabic name of the country, which is a type of adjective known as a nisba, formed from the dynastic name of the Saudi royal family, the Al Saud (Arabic: The Arabian peninsula is regarded as a central figure in the understanding of hominin evolution and dispersals.Arabia underwent an extreme environmental fluctuation in the Quaternary that led to profound evolutionary and demographic changes.
The Kingdom of Saudi Arabia was founded in 1932 by Ibn Saud.
He united the four regions into a single state through a series of conquests beginning in 1902 with the capture of Riyadh, the ancestral home of his family, the House of Saud.
However, experts such as Joan Oates had the opportunity to see the Ubaid period sherds in eastern Arabia and consequently conclude that the sherds dates to the last two phases of Ubaid period (period three and four), while handful examples could be classified roughly as either Ubaid 3 or Ubaid 2.
Thus the idea that colonists from Saudi Arabia had emigrated to southern Mesopotamia and founded the region's first sedentary culture was abandoned.
It is the only nation with both a Red Sea coast and a Persian Gulf coast, and most of its terrain consists of arid desert, lowland and mountains.