An Nafud An Nafud An Nafud or Al-Nefud or The Nefud () is a desert in the northern part of the Arabian Peninsula at , occupying a great oval depression. It is long and wide, with an area of . The Nafud is an erg, a desert region located in the north-central Saudi Arabia. Noted for its sudden violent winds, which account for the large crescent-shaped dunes. The sand in the Nafud is a brick-reddish color. Rain comes once or twice a year. In some lowland areas, namely those near the Hejaz Mountains, there are oases where dates, vegetables, barley, and fruits
Geography of Saudi Arabia runs north to south through the area of Riyadh. In the south, a coastal plain, the Tihamah, rises gradually from the sea to the mountains. Hejaz extends southward to the borders of mountainous Yemen. The central plateau, Najd, extends east to the Jabal Tuwayq and slightly beyond. A long, narrow strip of desert known as Ad Dahna separates Najd from eastern Arabia, which slopes eastward to the sandy coast along the Persian Gulf. North of Najd a larger desert, An Nafud, isolates the heart of the peninsula from the steppes of northern Arabia. South of Najd lies one of the