For 20 points, Mecca and Medina are found in what Islamic monarchy?
This nation's capital contains the Olaya District, and is found on the central Nejd plateau. This country is home to Ghawar, the world's largest conventional oil field, and Aramco is its national oil company. It borders both the Red Sea and Persian Gulf, and a city in this country is home to the Ka'aba. It's southernmost portion is the massive sand desert Rub ‘al Khali, or the "Empty Quarter". For 20 points, Mecca and Medina are found in what Islamic monarchy?
This nation's capital contains the Olaya District, and is found on the central Nejd plateau.
Kingdom of {Saudi Arabia}