Forests cover more than 60 % of the Vercors area. On the foothills and up to around 900 m, they are made mainly of oaks, hornbeams and in fresh places, of ashes (Royans, foothills of the Coulmes plateau...). The boxwood is already present and extends its influence in the less sprinkled zones (Trièves, Diois) where woodland pines and oaks form clear forests already announcing the "South" landscapes.
Between 900 and 1500 m, the mountain zone is characterized by magnificent beech-fir groves (Four-Mountains, Lente forest, ...).
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From 1500 m to about 2200 m, the subalpine forests of spruces and mugo
pines overlap sloping moors, screes and subalpine meadows, a typical
man-made landscape.