Libya, officially the State of Libya, is a country in the Maghreb region of North Africa. It borders the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad to the south, Niger to the southwest, Algeria to the west, and Tunisia to the northwest, as well as maritime borders with Greece, Italy and Malta to the north. Libya comprises three historical regions: Tripolitania, Fezzan, and Cyrenaica. With an area of almost 1.8 million km (700,000 sq mi), it is the fourth-largest country in Africa and the Arab world, and the 16th-largest in the world. Libya claims 32,000 square kilometres of southeastern Algeria, south of the Libyan town of Ghat. The country's official religion is Islam, with 96.6% of the Libyan population being Sunni Muslims. The official language of Libya is Arabic, with vernacular Libyan Arabic being spoken most widely. The majority of Libya's population is Arab. The largest city and capital, Tripoli, is located in northwestern Libya and contains over a million of Libya's seven million people.