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Area:  919,590  sq  mi  (2,381,740  sq  km)  /  World Rank: 12
Location:  Northern  Hemisphere,  straddles  Eastern and Western Hemispheres. Northern Africa bordering  the Mediterranean Sea  to  the north, Tunisia and Libya to the east, Niger to the southeast, Mali to the southwest,  Mauritania  and  Western  Sahara  to  the west, Morocco to the northwest
Coordinates: 28°00′ N, 3°00′ E
Borders: 3,933 mi  (6,343 km)  total boundary  length; Tunisia  598 mi  (965  km),  Libya  610 mi  (982  km),Niger  594  mi  (956  km),  Mali  855  mi  (1,376  km), Mauritania 288 mi (463 km), Morocco 993 mi (1,601km)
Coastline: 620 mi (998 km)

Territorial Seas: 12 NM (22 km)
Highest Point: Mt. Tahat, 9,853 ft (3,003 m)
Lowest Point: Chott Melrhir, 131  ft  (40 m) below  sea level
Longest Distances: 1,500 mi (2,400 km) E-W/ 1,300 mi (2,100 km) N-S
Longest River: Chelif, 143 mi (230 km)
Natural Hazards: Desert  regions  subject  to hot winds, called  sirocco,  which  cause  sandstorms, most  common in summer; sporadic torrential rains cause flooding and mudslides (most recent November 2001); mountainous regions subject to earthquakes
Population:  31,736,053  (July  2001  est.)  /  World Rank: 34
Capital City: Algiers, centrally located on the northern coast of the Mediterranean Sea
Largest City: Algiers (population estimated at 3 million)

The largest of the three countries (Algeria, Morocco, and Tunisia) that form the Maghreb region of northwest Africa, Algeria is the second-largest country on the continent, surpassed in size only by Sudan. It is a little lessthan 3.5 times the size of Texas and as large as the whole of Western Europe.More than 80 percent of Algeria’s land is part of the Sahara Desert, and almost completely uninhabited. To the north of the Sahara, roughly paralleling the country’s Mediterranean border, lies the Tell region. It comprises a narrow strip of coastal plains and the two Algerian sections of the Atlas Mountains, as well as a plateau region that separates them. The Atlas Mountains cover much of Morocco and extend eastward into Tunisia. Within Algeria they are known as the Tell Atlas and Saharan Atlas systems.  The  northeastern  corner  of  Algeria,  where  a compact massif area is broken up into mountains, plains, and basins, differs from the Tell region in that its prominent topographic features do not parallel the coast. Algeria lies on the African Tectonic Plate. Major seismic  activity  periodically  occurs  in  the  northern  Tell ranges,  threatening  the  lives  of  inhabitants  with  earthquakes  and  mudslides.  About  20,000  Algerians  were killed by major earthquakes  in 1790. Thousands of people were killed by earthquakes at Chlef in 1954 and 1980. A  land boundary dispute between Algeria and Tunisia was settled in 1993 but Libya still claims land in a portion of southeast Algeria.

Algeria borders the Mediterranean Sea on the north. The major cities of Algiers, Oran, and Annaba are located on Algeria’s narrow, intermittent coastal plains, as well as the port cities of Bejaia and Skikda. These plains alternate with massifs along much of the coast, except for the easternmost section, where the coast is mostly mountainous.

Algeria’s geographical diversity makes for a range of climatic conditions. The northern part of the country has a Mediterranean climate with mild, wet winters and hot, dry summers. Temperatures range from 50° to 54°F (10° to 12°C) in winter to 75° to 79°F (24° to 26°C) in summer. The plateau region has a semiarid climate, with a greater range  of  temperatures  between  the  summer  and winter months. Summer  temperatures average 79°  to 82°F  (26° to 28°C) and winter temperatures average 39° to 43°F (4° to 6°C), with frost and occasional snow on the massifs. Temperatures  vary  the  most  in  the  Sahara  Desert region, which  has  an  arid  climate. Days with  temperatures  of  95°F  (35°C)  or  higher  can  be  accompanied  by nights with temperatures below freezing. Temperatures range  from  14°  to  93°F  (-10°  to  34°C),  and  reaching extreme  highs  of  120°F  (49°C).  The  hot,  dusty  wind called the sirocco is common in the summer.

South of the Saharan Atlas, the Algerian portion of the Sahara Desert extends southward 931 mi (1,500 km) to the Niger and Mali frontiers, with an average elevation of about 1,500 ft (460 m). Immense areas of sand dunes, called ergs, occupy about one-fourth of the region. Among these areas, the two major ones are the Grand Erg
Occidental (Great Western Erg) and the larger Grand Erg Oriental (Great Eastern Erg), where enormous dunes 6.5 to 16.5 ft (two to five meters) high are spaced about 130 ft (40 m) apart. Much of the remainder of the desert is covered by bare, rocky platforms called hamada that are elevated  above  the  sand  dunes.  Almost  the  entiresoutheastern quarter is taken up by the Ahaggar Mountains. Surrounding the Ahaggar are sandstone plateaus cut by deep gorges, and to the west a flat, pebble-covered expanse stretches to the Mali frontier. The  desert  can  be  divided  into  two  sectors.  The northern one extends a little less than half the distance toAlgeria’s southern borders. Less arid than the area to the south, it supports most of the few people who live in the region, and most of the region’s oases are found here. The sand dunes of the Grand Erg Oriental and the Grand Erg Occidental are its most prominent topographical feature, but between them lie plateaus, including a complex lime- stone structure called the M''zab, where the M''zabite Berbers have settled. The southern zone of the Sahara is almost totally arid. Barren rock predominates, and its most prominent feature is the Ahaggar range. Vegetation  in  the  desert,  which  includes  acacia, jujube, and desert grasses, is sparse and unevenly distributed.

Natural gas and petroleum dominate Algeria’s economy. Its natural gas reserves, concentrated in the northeastern and north-central parts of the country, are among the largest in the world, as are its phosphate deposits. Algeria’s petroleum reserves are among the largest in Africa. Algeria is also the only African country that produces mercury. Other natural resources include iron ore,bentonite,  uranium,  lead,  zinc,  kaolin,  barites,  sulfur, strontium, fuller’s earth, and salt. Forestry products include cork, firewood, charcoal, and wood for industrial use.