The Dhofar is the largest of the eleven Governorates in the Sultanate of Oman in terms of area. It lies in Southern Oman, on the eastern border with Yemen. It is a rather mountainous area that covers 99,300 km2 (38,300 sq mi) and has a population of 250,000 as of the 2010 census. The largest city, as well as capital of the Governorate, is Salalah. Historically the region was the chief source of frankincense in the world.