Rainforest, also spelled rain forest, luxuriant forest, generally composed of tall, broad-leaved trees and usually found in wet tropical uplands and lowlands around the Equator.
A brief treatment of rainforests follows. For full treatment, seetropical forest.
Rainforests usually occur in regions where there is a high annual rainfall of generally more than 1,800 mm (70 inches) and a hot and steamy climate. The trees found in these regions are evergreen. Rainforests may also be found in areas of the tropics in which a dry season occurs, such as the “dry rainforests” of northeastern Australia. In these regions annual rainfall is between 800 and 1,800 mm and as many as 75 percent of the trees are deciduous.