, Morocco]] in the Sonoran Desert of Arizona]]A desert is a landscape form or region that receives very little precipitation. Deserts are defined as areas that receive an average annual precipitation of less than 250 mm (10 in). In the Köppen climate classification system, deserts are classed as (BW).TerminologyDeserts are located where vegetation cover is exceedingly sparse correspond to the 'hyperarid' regions of the earth, where rainfall is exceedingly rare and infrequent.Deserts are