The core of Réunion National Park covers in the interior of the island, corresponding to 42% of its surface and extending over the land of 23 communes. This core area also includes some inhabited and cultivated land. Adjacent to the core is an area of voluntary commitment (aire d'adhésion, buffer zone) covering and touching all 24 communes on the island. Altogether, the park extends over more than 75% of the island.: The island of Réunion is volcanic in origin and sits over a hotspot. Two volcanoes form its backbone: The Piton des Neiges, over high, and the still active Piton de la Fournaise.