Editing Palearctic realm (section)

===Sahara and Arabian deserts===
[[Horse latitudes|A great belt of deserts]], including the [[Atlantic coastal desert]], [[Sahara]] Desert, and [[Arabian Desert]], separates the Palearctic and [[Afrotropic]] ecoregions. This scheme includes these desert ecoregions in the palearctic realm; other biogeographers identify the realm boundary as the transition zone between the desert ecoregions and the Mediterranean basin ecoregions to the north, which places the deserts in the Afrotropic, while others place the boundary through the middle of the desert.