Liwa Oasis is in the south near the undefined border with Saudi Arabia, and about to the northeast is Al Buraymi Oasis, which extends on both sides of the Abu Dhabi-Oman border. Prior to withdrawing from the area in 1971, Britain delineated the internal borders among the seven emirates in order to pre-empt territorial disputes that might hamper formation of the federation. In general, the rulers of the emirates accepted the British intervention, but in the case of boundary disputes between Abu Dhabi and Dubai, and also between Dubai and Sharjah, conflicting claims were not resolved until after the UAE became independent. The most complicated borders were in the Western Mountains, where five of the emirates contested jurisdiction over more than a dozen enclaves. Mountains The UAE also extends for about along the Gulf of Oman, an area known as Al-Batinah coast. The Western Hajar Mountains (Jibāl Al-Ḥajar Al-Gharbī), rising in places to , separate Al-Batinah coast from the rest of the UAE. Beginning at the UAE-Oman border on the Persian Gulf coast of the Ras Musandam (Musandam Peninsula), the Western Mountains extend southeastward for about to the southernmost UAE-Oman frontier on the Gulf of Oman. The range continues as the Eastern Hajar Mountains (Jibāl Al-Ḥajar Ash-Sharqī) for more than into Oman. The steep mountain slopes run directly to the shore in many places. Nevertheless, there are small harbors at Dibba Al-Hisn, Kalba, and Khor Fakkan on the Gulf of Oman. In the vicinity of Fujairah, where the mountains do not approach the coast, there are sandy beaches. Climate The climate of the UAE generally is very hot and sunny. The hottest months are July and August, when average maximum temperatures reach above on the coastal plain. In the Western Hajar Mountains, temperatures are considerably cooler, a result of increased altitude. Average minimum temperatures in January and February are between . During the late summer months, a humid southeastern wind known as the sharqi makes the coastal region especially unpleasant. The average annual rainfall in the coastal area is less than , but in some mountainous areas annual rainfall often reaches . Rain in the coastal region falls in short, torrential bursts during the summer months, sometimes resulting in floods in ordinarily dry wadi beds. The region is prone to occasional, violent dust storms, which can severely reduce visibility. The Jebel Jais mountain cluster in Ras Al Khaimah has experienced