[1] The island is one of the volcanic swells that make up the Cameroon line of extinct and active volcanoes.

The basalt has been deeply eroded, leaving spectacular towers of the harder phonolite rising almost vertically from the rainforest.

The 1999 trip found that the mountain rises from a heavily forested plateau with elevation 600 to 700 metres (2,000 to 2,300 ft).

[4] The 1999 expedition was by members of Ecofac, a Non-Government Organization that plans to assist in conservation through helping to develop ecotourism on the island.

Other endemic species are the skink Feylinia polylepis, the burrrowing snake Typhlops elegans and the frog Leptopelis palmatus.