[1] The park is also an Important Bird Area overlapping with the national park and is divided into two main parts; the Befotaka Forest 43,423 hectares (107,300 acres) and the Soarano Forest 24,145 hectares (59,660 acres).

It is served by unpaved roads which may be impassable during the wet season of December to June.

Due to the rugged topography and the humid climate, Madagascar's second largest rain forest is within the park.

They include Mystroxylon aethiopicum, a member of the Celastraceae which is said to help with injuries, and the sap of Medinilla sp, is used for coughs.

Marsh vegetation includes the screw-pine (Pandanus) and species of sedge (Carex).