Gyali
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Gyali (Greek Γυαλί "glass", also spelled Yiali or Yali) is a volcanic Greek island in the Dodecanese, located halfway between the south coast of Kos (Kardamena) and Nisyros.
The island is 6 kilometres long and between 4 kilometres and 500 Metres across. It has a 180 metre cave. The island is barren of vegetation. Its northeastern part is almost entirely made of obsidian, its southwestern part of pumice. Both parts are connected by a narrow beach. There are no residents on the island anymore in recent years.