Most of the National Park, which covers 18,900 ha in the centre of the island of Tenerife (Canary Islands), is 2,000 m above sea level. It essentially consists of one big caldera, known as Circo de Las Cañadas, and the magnificent stratovolcano Teide, which is the highest point in Spain and the whole of Marcaronesia, with an altitude of 3,717.98 m. Along with its geological particularities and beautiful landscape, the extreme conditions generated by altitude, strong sunlight, wide daily temperature range and a lack of humidity have led to the presence of a very rich and unique flora adapted to these harsh conditions. Of the fauna of the park a notable highlight are the invertebrates that comprise more than 1,400 species, many of them endemic, thus of great scientific interest. The National Park is listed as a World Heritage Natural Site.