The Western Desert of Egypt is an area of the Sahara which lies west of the river Nile, up to the Libyan border, and south from the Mediterranean sea to the border with Sudan. It is named in contrast to the Eastern Desert which extends east from the Nile to Red Sea. The Western Desert is mostly rocky desert, though an area of sandy desert, known as the Great Sand Sea, lies to the west against the Libyan border. The desert covers an area of 262,800 sq miles (680,650 km2) which is two-thirds of the land area of the country. Its highest elevation is 3,300 ft (1000m) in the Gilf Kebir plateau to the far south-west of the country, on the Egypt-Sudan-Libya border. The Western Desert is barren and uninhabited save for a chain of oases which extend in an arc from Siwa, in the north-west, to Kharga in the south. However it has been the scene of conflict in modern times, particularly during the Second World War.
Administratively the Western Desert is divided between various governorates; in the north and west, the Matrouh Governorate administers the area from the Mediterranean south to approx 27*40' N latitude, and the New Valley Governorate from there to the Sudan border, while in the east parts of the Western Desert lie in the Giza, Fayyum, Beni Suef, and Minya Governorates.
The region is described by one writer as "a plateau standing on average some 500 feet above sea level, barren, rubble- and boulder-strewn, dark brown in colour, occasionally dotted with scrub, and, at first sight, flat". He also states that little of the area conforms to "the romantic view... the Hollywood scenery of wind-formed dunes with occasional oases fringed with palm"; those such areas do exist, in the Sand Sea where dunes are sculpted into fantastic shapes; the area is also the location of a series of oases created where the land dips sufficiently to meet the aquifer. These lie in an arc from Siwa in the north-west near the Libyan border, to Bahariya, Farafra, Dakhla, then Kharga in the south. East of Siwa lies the Qattara Depression, a low-lying area dotted with salt marsh and extending 190 miles west to east and 84 miles north to south. Further to the east, near the Nile, another depression gives rise to the Fayyum Oasis, a heavily populated area separate from the main Nile valley.