Isalo National Park is a National Park in the Ihorombe Region of Madagascar. The park is known for its wide variety of terrain, including sandstone formations, deep canyons, palm-lined oases, and grassland. The closest town is Ranohira, and the closest city is Toliara. A local guide is required for visitors entering the park, and guides and porters can be hired in Ranohira. Treks in the park can last from several hours to a week or longer. A total of 340 faunal species are known to inhabit the area, including 82 species of birds, 33 species of reptiles, 15 species of frogs and 14 species of mammals. Several different species of lemur are found in the park.