Very dry areas with an annual sum of precipitation of less than 300 mm occur in different regions of the world. In addition to the typical areas of desert in the subtropics such as the Sahara or Central Australia, such very dry areas are found in the interiors of the continents of Asia and North America. Other such regions are coastal areas adjacent to cold ocean currents, or in the lee of large mountain ranges (see above). Large parts of the polar regions are also among these very dry areas, since due to the low temperatures there is only a small amount of moisture in the atmosphere.
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