Because of their proximity to the Sahara, most of the Cape Verde islands are dry, but on islands with high mountains and farther away from the coast, by orography, the humidity is much higher, providing a rainforest habitat, although much affected by the human presence. Northeastern slopes of high mountains often receive a lot of rain while southwest slopes do not. These umbria areas are identified with cool and moisture. Cape Verde lies in the Cape Verde Islands dry forests ecoregion.