Consisting of 2000 square km (770 square miles) this is the largest protected region in the country, accounting for roughly 7% of the entire country. The reserve is partly famous for the Goliath frog the largest in the world.

There are two mountain peaks within the reserve, but other than this, the whole reserve is covered in rainforest. A series of treks are laid out throughout the reserve. 

There are 265 species of bird, making it a popular birding location.

There are also 105 species of mammal, including 16 species of primate. Of particular interest, these include both the gorilla and the chimpanzee, as well as the mandrill, the black colobus and the coloured mangabey.

Both bush and forest elephants are represented within the park boundaries.