The areas susceptible to desertification are arid, semi-arid and dry sub-humid areas, (ie those areas where the annual precipitation ratio is between 0.05 and 0.65). Thus, according to the established definition, large areas of Spanish geography are potentially affected by the desertification process. In fact, more than two thirds of the Spanish territory belong to the categories of arid, semi-arid and dry sub-humid areas.

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