The Dhofar Mountains of southern Oman, contiguous with the eastern Yemeni Hadhramaut West: Bordering the eastern coast of the Red Sea are the Sarawat, which can be seen to include the Haraz Mountains of eastern Yemen, and the 'Asir and Hijaz Mountains of western Saudi Arabia, the latter including the Midian in northwestern Saudi Arabia Northwest: Aside from the Sarawat, the northern portion of Saudi Arabia hosts the Shammar Mountains, which include the Aja and Salma subranges Central: The Najd hosts the Tuwaiq Escarpment or Tuwair range From the Hejaz southwards, the mountains show a steady increase in altitude westward as they get nearer to Yemen, and the highest peaks and ranges are all located in Yemen. The highest, Jabal An-Nabi Shu'ayb or Jabal Hadhur of the Haraz subrange of the Sarawat range, is high. By comparison, the Tuwayr, Shammar and Dhofar generally do not exceed in height. Not all mountains in the peninsula are visibly within ranges. Jebel Hafeet in particular, on the border of the UAE and Oman, measuring between , is not within the Hajar range, but may be considered an outlier of that range. Land and sea Most of the Arabian Peninsula is unsuited to agriculture, making irrigation and land reclamation projects essential. The narrow coastal plain and isolated oases, amounting to less than 1% of the land area, are used to cultivate grains, coffee and tropical fruits. Goat, sheep, and camel husbandry is widespread elsewhere throughout the rest of the Peninsula. Some areas have a summer humid tropical monsoon climate, in particular the Dhofar and Al Mahrah areas of Oman and Yemen. These areas allow for large scale coconut plantations. Much of Yemen has a tropical monsoon rain influenced mountain climate. The plains usually have either a tropical or subtropical arid desert climate or arid steppe climate. The sea surrounding the Arabian Peninsula is generally tropical sea with a very rich tropical sea life and some of the world's largest, undestroyed and most pristine coral reefs. In addition, the organisms living in symbiosis with the Red Sea coral, the protozoa and zooxanthellae, have a unique hot weather adaptation to sudden rise (and fall) in sea water temperature. Hence, these coral reefs are not affected by coral bleaching caused by rise in temperature as elsewhere in the indopacific coral sea. The reefs are also unaffected by mass tourism and diving or other large scale human interference.