This transnational extension (Benin, Burkina Faso) to the W National Park of Niger, inscribed in 1996 on the World Heritage List, cover a major expanse of intact Sudano-Sahelian savannah, with vegetation types including grasslands, shrub lands, wooded savannah and extensive gallery forests. It includes the largest and most important continuum of terrestrial, semi-aquatic and aquatic ecosystems in the West African savannah belt. The property is a refuge for wildlife species that have disappeared elsewhere in West Africa or are highly threatened. It is home to the largest population of elephants in West Africa and most of the large mammals typical of the region, such as the African Manatee, cheetah, lion and leopard. It also harbours the only viable population of lions in the region.
The W-Arly-Pendjari Complex is a transnational property shared between the Republic of Niger, Burkina Faso and the Republic of Benin in West Africa. Located in the transition zone between the savannas of the Sudanese region and the forested Guinean region, the W-Arly-Pendjari Complex lies at the heart of the most extensive protected area block in the West African Woodlands/Savanna Biogeographical Province and includes the largest and most important continuum of terrestrial, semi-aquatic and aquatic ecosystems in the West African savanna belt. The property encompasses 1,714,831 ha and is a contiguous mosaic of nine protected areas. It includes the trinational complex of W Regional Park (shared between Benin, Burkina Faso and Niger), Arly National Park (Burkina Faso), Pendjari National Park (Benin) and the hunting zones of Koakrana and Kourtiagou (Burkina Faso) and Konkombri and Mékrou (Benin).