At the middle of the way from Kos to Nisyros, some 4-5 nautical miles southern to the island of Kos, it is found the small islet of Gyali. In fact, the islet is only a volcanic rock thrown in the sea, where the locals, mainly the residents of Nisyros, mine for pumice-stone. The island has also deposits of obsidian and perlite. Traces of prehistoric human activity, from the Neolithic and Early Bronze Age, have been detected on the island.
Access is possible only by boat which you will rent yourself, and after you have taken permission for the visit from the mining agency working there. Don’t forget to take water with you and possibly a sandwich, as it is not possible to find something to eat or drink on the islet. Also, don’t miss to be suitably dressed and of course don’t forget to have a hut and sunglasses, especially if you visit the island in summer, because the place is extremely dry and the sun very strong.