Sahara

             Sahara ( الصحراء الكبرى) is the world's hottest desert, the third largest desert after Antarctica and the Arctic. At over 9,400,000 square kilometres (3,600,000 sq mi), it covers most of North Africa, making it almost as large as China or the United States. The Sahara stretches from the Red Sea, including parts of the Mediterranean coasts, to the outskirts of the Atlantic Ocean. To the south, it is delimited by the Sahel, a belt of semi-arid tropical savanna that composes the northern region of central and western Sub-Saharan Africa. 
             The Sahara comprises several distinct ecoregions, and with their variations in temperature, rainfall, elevation, and soil, they harbor distinct communities of plants and animals. These ecoregions are: Atlantic coastal desert, North Saharan steppe and woodlands, Sahara desert ecoregion, South Saharan steppe and woodlands, West Saharan montane xeric woodlands, Tibesti-Jebel Uweinat montane xeric woodlands, Saharan halophytics, Tanezrouft. Some of the Saharian sand dunes can reach 180 metres (590 ft) in height.

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Libyan Desert

              Libyan Desert it extends approximately 1100 km from east to west, and 1,000 km from north to south, in about the shape of a rectangle. The desert features a striking diversity of landscapes including mountains such as Jebel Uweinat (1980 m), the Gilf Kebir plateau, and sand seas. 
              The Libyan Desert is barely populated apart from the modern settlements at oases of the lower Cyrenaica region in southeastern Libya. The indigenous population is Berber. In most of Upper Egypt, the desert is close to the Nile River, with a seasonal flood plain only a few kilometers wide between river and desert.  North of the Gilf Kebir plateau, among the shallow peripheral dunes of the southern Great Sand Sea, is a field of Libyan desert glass.

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Algerian desert

            The Algerian Desert (الصحراء الجزائرية ) is a located in north-central Africa and is part of the Saharan Africa. The desert occupies more than four-fifths of the Algerian territory. Its expansion starts from the Saharan Atlas, more or less as a stony desert and the farther inland you get the more of a sand dune desert it becomes. In the southwestern parts is the mountain range Tassili n'Ajjer located.
             The highest official temperature was 50.6 °C (123.1 °F) at In Salah.

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Nubian Desert

            The Nubian Desert (صحراء النوبة‎ Şaḩrā’ an Nūbyah) is in the eastern region of the Sahara Desert, spanning approximately 400,000 km² of northeastern Sudan between the Nile and the Red Sea. The arid region, a largely sandstone plateau, has lots of wadis flowing towards the Nile . There is virtually no rainfall in the Nubian, and there are no oases. The traditional inhabitants of the area are the Nubians. The Nubian Desert affected the civilization in ancient Egypt in many ways.
           The Nubian desert is the only habitat for the critically endangered palm Medemia argun, which only appears rarely in some oases in the desert.

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