The Comoé National Park is a Biosphere Reserve and UNESCO World Heritage Site in the Zanzan District. It is the largest protected area in West Africa, with an area of 11,500 km2, and ranges from the humid Guinea savanna to the dry Sudanian zone. This steep climatic north-south gradient allows the park to harbour a multitude of habitats with a remarkable diversity of life. The park was initially added as a World Heritage Site due to the diversity of plant life present around the Comoé River, including pristine patches of tropical rain forest that are usually only found further south.