The United Arab Emirates occupy a corner of Arabia bounded by Saudi Arabia to the west and south, Oman to the east, the Gulf of Oman and Oman to the northeast and the Persian Gulf to the north. The northern coast stretches for about along the southern shore of the Persian Gulf and largely consists of salt pans that extend inland. There are numerous offshore islands, the ownership of some of which is disputed with neighbouring states. To the south is the Rub' al Khali desert, an enormous expanse of billowing sand dunes. Two large oases in the east are the Liwa Oasis, near the undefined border with Saudi Arabia, and Al-Buraimi Oasis, which includes Al Ain on the UAE side of the border with Oman. To the east, the land rises and becomes mountainous, this being the northwestern end of Al Hajar Mountains, of which Jebel Hafeet near Al-Ain may be considered an outlier, and which include the Ru'us al-Jibal (literally Heads of the Mountains) in the Musandam Peninsula. Beyond these, the coast on the Gulf of Oman is rugged.