A forest is Land with at least 10\% of its surface area stocked by trees of any size or formerly having had such trees as Cover and not currently built-up or developed for agricultural use (USDAFS 1989).
Other /More definition:
A Forest is Terrestrial ecosystem (biome) with enough average annual precipitation (at least 76 centimeters or 30 inches) to support growth of various species of trees and smaller forms of vegetation.

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