Libya falls into three main geographical regions—Tripolitania in the west, Fazzan in the southwest, and Cyrenaica in the east. Tripolitania in turn can be divided into three zones. In the north is a low-lying coastal plain called the Jifarah, which, although mainly arid, has several irrigated areas. It also includes the city of Tripoli. South of the Jifarah is a mountainous zone (highest altitude: c.2,500 ft/760 m) known as the Jabal; it is mostly arid and barren but has scattered areas of cultivation. South of the Jabal is an upland plateau, largely desert, but crossed by a string of oases in the south. South of Tripolitania is the Fazzan region, which is largely made up of sandy desert but has a number of scattered oases.
Cyrenaica is Libya's largest region. In the N along the Mediterranean is a narrow upland plateau (highest altitude: c.2,000 ft/610 m) called the Jabal al Akhdar, which includes the cities of Benghazi and Darnah. In the west the Jabal al Akhdar drops abruptly to the shore of the Gulf of Sidra, which deeply indents Libya's Mediterranean coastline, and in the east it falls gradually toward the Egyptian border, where there is another upland region. South of the Jabal al Akhdar is a vast region of sandy desert, which in the east includes part of the Libyan Desert. Cyrenaica is fringed in the southwest by the Tibesti Massif (located mostly in Chad), which includes Libya's loftiest point, Bikku Bitti, or Bette Peak (c.7,500 ft/2,290 m).
Berbers once constituted the chief ethnic group in Libya but have been largely assimilated into Arab culture, with those of Arab-Berber descent making up over 95% of the population. There are scattered traditional Berber communities, and in Fazzan many persons are of mixed Berber and black African descent. Tribal influences remain relatively strong among Libyan natives. There are also smaller groups of Greeks, Maltese, Italians, Egyptians, South Asians, and others. Labor shortages in the agriculture and petroleum industries have attracted many foreign workers, mostly from Egypt, Tunisia, and Turkey. Some 5% of the people live as pastoral nomads, mostly in Cyrenaica. Arabic is the official language; Italian and English are also widely understood. The Berber language was banned under Qaddafi's rule. The great majority of the population is Sunni Muslim.