Lying between Fort Dauphin and Berenty, it protects a surprising range of habitats for its 760 sq kms. Rainfall patterns over the Anosy mountain range have led to eastern humid rainforest at one extreme, and lower rainfall in another section has given rise to dry spiny forest at the other.
The area in between is the unique transitional Ranopiso forest habitat, characterised by the locally endemic triangular palm. A wide variety of fauna exists in the park, including 129 species of birds such as red-tailed newtonia and running coua, twelve species of lemur including ring tailed, fosa, fanalouc and striped civet – all live in the reserve, where camping is currently the only accommodation.