The Deserts of the World
Europe is the only continent without deserts; there are, however, semiarid portions around the Black and Caspian seas, in parts of Ukraine and the N Caucasus. In Asia a great desert, the Gobi, exists in the middle latitudes chiefly because of its remoteness from water. Also in central Asia are the Kara Kum and Kyzyl Kum deserts. Farther south there are desert areas in NW India and through S Pakistan, Afghanistan, Iran, Iraq, and Arabia; these are largely the result of their situation in a subtropical high-pressure belt and of the distribution of pressure areas that produce cold, dry winds in winter and hot, dry winds in summer.
The Sahara, the largest desert in the world, is in Africa. Second only to the Sahara in area is the desert region of central and W Australia, lying in a high-pressure belt and in the path of the trade winds (which lose much of their moisture on the windward slopes of the east-coast mountains). South America has deserts on the coast and interior of Chile and E of the Andes in Argentina and Patagonia. In North America, deserts are found from N Mexico northward through parts of the SW and W United States. Extreme desert conditions exist in the Mojave Desert, the Imperial Valley, and Death Valley. The northern plateau region of Mexico and the adjacent portions of Texas, Arizona, and New Mexico have less extreme desert conditions with a quite abundant growth of mesquite, greasewood, creosote bush, yucca, and various species of cactus. Middle-latitude deserts are found in parts of the Great Basin.