Jebel Akhdar (also spelled Jabal Akhdar or Al Jabal Al Akhdar) means "Green Mountains" is a mountain range that is part of the Al Hajar Mountains. It is located approximately 150 km from the capital Muscat and its highest point, Jebel Shams (Mountain of the Sun), is around 3,000 metres high. The roughly annual 300mm of rain at higher altitudes, allows the growth of shrubs and trees and supports agriculture. Hence the name "Green Mountains". Pages of recent history have been written on this marvellous portion of Oman, between 1954 and 1959 the area became a site of the Jebel Akhdar War, a conflict between Omani forces loyal to the sultan of Oman (aided by British soldiers, including the Special Air Service) and Saudi Arabian-backed rebel forces of the inland Imamate of Oman.