Turkey has very rich ecosystems and habitats in which various types of vegetation communities and fauna are found. These properties of Turkey depend on its geographical position, different climatic region, mountainous topographical conditions and climatic changes occurred during the Pleistocene. Several field works have been conducted during the period of 1975-2008. The field observations and analyses of data reveal that Turkey's forests can be divided into six main forest ecosystems (Black sea region, Marmara transitional region, Mediterranean region, Mediterranean transitional region, Inner and Eastern anatolian region, Southern anatolian region) in terms of floristic composition, forest productivity and climatic properties.