Changes

The topography of Ankarana is characterised by limestone emerging from a basaltic plain 50m above sea level, forming the ''[[Tsingy]]'' (sharp limestone karst pinnacles). Numerous underground caves and canyons traverse the massif. Four major rivers flow through the reserve: Besaboba eastward, Ankarana from the north, Antenan'Ankarana and Mananjeba from the south. The first three are underground rivers whose specific courses currently remain unknown.

For visitors of the reserve there is much to discover in the forest, rivers and caves. In 2010 a biological inventory identified:

* 50 shellfish species and a large number of Tsingy snails