NATURAL FOREST : Trees grow naturally since the old times

Meaning of natural forests are overgrown with forest trees naturally and has existed since long ago. Natural forests can survive without human intervention or the exploitation of forest called "Primary forests". In Primary forests hasn't found  human intervention inside or natural disasters factors also can form secondary natural forest.

Indonesia has very wide natural forests, but the day this forest area continues to decrease. Some even say that Indonesia lost 1.6 to 2 million hectares of natural forests each year. Indonesia's natural forests are generally covered by dipterocarp species, which is a type of wood demand in the market, so it's natural forests are subjected to exploitation.

Species composition of natural forests in Indonesia vary depending on the location where the growth of the forest. The types of trees in natural forests in western Indonesia is different from eastern Indonesia, although there are species that spread from west to east. There are several natural forest vegetation zone in Indonesia, namely the western zone of natural forest, the eastern zone and the transition zone or the middle.