Its SW part consists of thick layers of pumice-stone, while its NE part consists of obsidian currents and perlite. These two parts are connected by a narrow isthmus and beach made of modern reef sediments. In the island there is a pumice-stone mining plant. Aghios Antonios islet is in a very close distance and has a beautiful beach. Enjoy a daily excursion to Giali islet during your stay on Nisyros.