Physically, Oman, except for the Dhofar (Zufar) region, consists of three divisions: a coastal plain, a mountain range, and a plateau. The coastal plain varies in width from 16 km (10 mi) to practically nothing near Muscat, where the hills descend abruptly to the sea. The highest point, Jabal Shams, is at 2,980 (9,777 ft) in the Al Jabal range of the north. The plateau has an average height of about 300 m (1,000 ft) and is mostly stony and waterless, extending to the sands of the Ar-Rub' al-Khali. The coastline southward to Dhofar is barren and forbidding. From Salalah, a semicircular fertile plain extends to the foot of a steep line of hills, some 1,500 m (4,920 ft) high, and forms the edge of a stony plateau also extending to the sands of the Empty Quarter.