Gyali (Greek Γυαλί, also spelled Yiali or Yali) is a volcanic Greek island in the Dodecanese, located halfway between Kos and Nisyros. A volcano is a geological landform usually generated by the eruption through a planets surface of magma, molten rock welling up from the planets interior. ... The Dodecanese (Greek: Δωδεκάνησα, Dodekánisa, meaning twelve islands) are a group of Greek islands in the Aegean Sea, off the southwest coast of Turkey. ... Port of Kos Archaeological site Tree of Hippocrates Roman amphitheater Kos or Cos (36°51′N 27°14′E, Greek Κώς, Turkish: Ä°stanköy) is a Greek island in the Dodecanese group of islands, in the Aegean Sea, which it separates from the Gulf of Cos . ... Satellite image of Nisyros island, an active volcano Nisyros (Greek: Νίσυρος; also transliterated Nissiros; see also List of traditional Greek place names) is a volcanic Greek island located in the Aegean Sea. ...