Sapo National Park protects over 1,800 square kilometres of West African lowland rainforest, and Greenville is the closest town of any size. The forest holds forest elephants, leopards, chimpanzees, pygmy hippos, and over 100 mammal species, as well as enormous biodiversity in birds and reptiles. It is one of the last large intact forest blocks in the Upper Guinea forest region.
Access from Greenville requires a vehicle and local guidance — the park's main entry points are several hours' drive over rough roads, and the necessary permits and guides should be arranged in advance through the Society for the Conservation of Nature in Liberia (SCNL). The park is not set up for casual visits, but for committed wildlife travellers who have done the preparation, it is exceptional.