Guinea is situated on the Atlantic coast of West Africa. The three major rivers of West Africa, the Gambia, the Niger and the Sénégal, all rise in Guinea. The country's natural resources are abundant, in addition to its hydropower potential, Guinea has most of the world's bauxite reserves, as well as significant iron, gold and diamond deposits. However, the economy is still largely based on subsistence agriculture. Guinea's wildlife is very varied, due to the wide range of habitats. The country's southern part is located in the Guinean Forests of West Africa biodiversity hotspot, while the northeast is dominated by dry savannah forests. Guinea's ecoregions are the Western Guinean lowland forests, Guinean montane forests, Guinean forest–savanna mosaic, West Sudanian savanna, and Guinean mangroves. Large mammal populations are concentrated in uninhabited, remote areas of parks and reserves, and these populations are in decline. Wildlife strongholds in Guinea include the Pinselly Classified Forest, the National Park of Upper Niger, the Badiar National Park, the Mount Nimba Strict Nature Reserve, the Ziama Massif, the Bossou Hills Reserve and the Diécke Classified Forest. Mammals in the country include the African Buffalo, the African Forest Buffalo, the African Forest Elephant, the Harnessed Bushbuck, the Guinea Baboon, the Giant Forest Hog, the Hippopotamus and the Pygmy Hippopotamus. As for the birds, the country is home to the Blue-Headed Wood-Dove, the Iris Glossy-Starling, the White-Necked Rockfowl and the White-Breasted Guineafowl.