a region in Saudi Arabia bordering on the Red Sea, formerly an independent kingdom: contains the Islamic holy cities of Medina and Mecca. About 150,000 sq. mi. (388,500 sq. km).
a region of W Saudi Arabia, along the Red Sea and the Gulf of Aqaba: formerly an independent kingdom; united with Nejd in 1932 to form Saudi Arabia. Area: about 348 600 sq km (134 600 sq miles)