In the southwest of the country, the Taï National Park protects the largest area of forest remaining in the Upper Guinean rainforest belt of West Africa. The vegetation is predominantly dense evergreen ombrophilous forest with emergent trees up to 60 m (200 ft) tall, with massive trunks and large buttresses or stilt roots. This mature tropical forest includes some 1,300 species of higher plants and has been designated as a World Heritage Site and a UNESCO Biosphere Reserve.[6] Another area that has been protected is the Comoé National Park, near the border with Burkina Faso.