The Dhofar Governorate (Arabic: محافظة ظفار, Muḥāfaẓat Ẓufār) 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 249,729 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. The local variety of Arabic is Dhofari Arabic, which is quite distinct from that of the rest of Oman and from Yemen.