The bigger part of the island is mountainous, constituted from volcanic rocks and elations of volumes, that were created by the activity of the volcano long time ago and shaped the valley of Lakki, craters and the mountains Profetes Elias (698m.), Agios Ioannis (588m.) and Agios Georgios (519m.). The Geological and tectonic structure of Nisyros encourages the presence of hot springs, that are used for therapeutic aims (iamatika loutra). Also the geomorphology of the region and the volcanic structure of rocks on the island, has encouraged the mining, as kaolin, sulphur and especially pumice and perlite, that is still profitable. Within the natural environment of Nisyros is also the rich flora and fauna, for which specialists have pronounced its uniqueness. Known kao, coveted since antiquity, was also used for making millstones, and was called Stone Nisyritis. The most characteristic new morphological element of Nisyros is the volcano that constitutes today the most important motive of visitors. This Islands uniqueness and its special natural beauty, beyond the scientific interest, renders it worth a visit. The volcanoΥs existence has been known since ancient time. The volcano today is "non active".