Volcanoes of the Aegean

Kos or Cos (; ) is a Greek island, which is part of the Dodecanese island chain in the southeastern Aegean Sea. Kos is the third largest island of the Dodecanese, after Rhodes and Karpathos; it has a population of 37,089 (2021 census), making it the second most populous of the Dodecanese after Rhodes. The island measures . Administratively, Kos constitutes a municipality within the Kos regional unit, which is part of the South Aegean region. The principal town of the island and seat of the municipality is the town of Kos.

Milos or Melos (; , ; ) is a volcanic Greek island in the Aegean Sea, just north of the Sea of Crete. It is the southwestern-most of the Cyclades islands.

Nisyros, also spelled Nisiros (; ), is a volcanic Greek island and municipality located in the Aegean Sea. It is part of the Dodecanese group of islands, situated between the islands of Kos and Tilos.

Antimilos (; ) is a Greek island in the Cyclades group, northwest of Milos. Administratively, it is part of the municipality of Milos. Antimilos is an uninhabited mass of trachyte (671 m height), often called Erimomilos (Desert Milos). It is a volcanic island and the crater is still obvious. Ancient inhabitants transformed the crater to an open rain tank. On the island lives a rare variation of the common goat called Capra aegagrus pictus. It is similar but not the same as the Cretan goat known as "kri-kri" (Capra aegagrus creticus).

Gyali ( "glass", also spelled Giali or Yali, pronounced ) is a Greek volcanic island in the Dodecanese, located halfway between the south coast of Kos (Kardamaina) and Nisyros. It consists of rhyolitic obsidian lava domes and pumice deposits (which are mined in huge quantities). No historical eruptions are known, but the most recent pumice eruptions overlie soils containing pottery and obsidian artifacts from the Neolithic period (10,000–4,500 BC). The island has two distinct segments, with the northeastern part almost entirely made of obsidian and the southwestern part of pumice. These are co

island in the Santorini caldera

Kolumbo () is an active submarine volcano in the Aegean Sea in Greece, about northeast of Cape Kolumbo, Santorini (Thira) island. The largest of a line of about twenty submarine volcanic cones extending to the northeast from Santorini, it is about in diameter with a crater across. It was first noticed by humans when it breached the sea surface in 1649–1650. The Smithsonian Institution's Global Volcanism Program treats it as part of the Santorini volcano, though at least one source maintains that it is a separate magmatic system.

island in the Santorini caldera