Submarine calderas

Krakatoa (), also transcribed (), is a caldera in the Sunda Strait between the islands of Java and Sumatra in the Indonesian province of Lampung. The caldera is part of a volcanic island group (Krakatoa archipelago) comprising four islands. Two of them are known as Lang and Verlaten; another, Rakata, is the only remnant of an island, also called Krakatoa, mostly destroyed by an eruption in 1883 which created the caldera.

volcanic region located in the Gulf of Pozzoles, west of Naples, Italy

Ischia ( , , ) is a volcanic island in the Tyrrhenian Sea. It lies at the northern end of the Gulf of Naples, about from the city of Naples. It is the largest of the Phlegrean Islands. Although inhabited since the Bronze Age, as a Greek emporium it was founded in the 8th or 9th century BCE, and known as Πιθηκοῦσαι, Pithekoūsai.

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.

island of the Japanese Volcano Islands chain south of the Ogasawara Islands, site of the 1945 Battle of Iwo Jima

island in the southern Indian Ocean

group of subantarctic islands that are part of New Zealand

volcano in Tonga

Antarctic island

thumb|right|300px|Ponza and the Pontine Islands. Ponza (Italian: isola di Ponza ) is the largest island of the Italian Pontine Islands archipelago, located south of Cape Circeo in the Tyrrhenian Sea. It is also the name of the commune of the island, a part of the province of Latina in the Lazio region.

Pacific Ocean bay on the southeastern coast of the Kamchatka Peninsula; inner part of Avacha Gulf

caldera in Thira municipality, Greece

island in South Lampung Regency, Lampung Province, Indonesia

isolated and uninhabited Japanese island in the Pacific Ocean considered part of the Volcano Islands and administered as part of Tokyo's Ogasawara subdistrict

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.

one of Kermadec Islands, New Zealand

supervolcano

mountain

Kuwae was a landmass that existed in the vicinity of Tongoa and was destroyed by volcanic eruption in fifteenth century, probably through caldera subsidence. The exact location of the caldera is debated. A submarine caldera, now known as Kuwae caldera and which is located between the Epi and Tongoa islands, is a candidate. Kuwae caldera cuts through the flank of the Tavani Ruru volcano on Epi and the northwestern end of Tongoa. Another potential candidate is a proposed caldera between Tongoa and Tongariki.

island in New Zealand

bight in New Zealand

Archipelago in the Sunda Strait, Indonesia

mountain

Vailuluu is a volcanic seamount discovered in 1975. It rises from the sea floor to a depth of and is located between Tau and Rose islands at the eastern end of the Samoa hotspot chain. The basaltic seamount is considered to mark the current location of the Samoa hotspot. The summit of Vailuluu contains a 2 km wide, 400 m deep oval-shaped caldera. Two principal rift zones extend east and west from the summit, parallel to the trend of the Samoan hotspot. A third less prominent rift extends southeast of the summit.

volcano in the southern part of Iturup in the Kuril Islands, claimed by Japan and administered by Russia

harbour in New Zealand

harbor in New Zealand

volcanic seamount to the north of New Zealand

bay in Hawaii, USA

is a group of islets in the Sea of Japan about west of the Japanese main island of Honshu. It is administered as part of the town of Fukaura in Aomori Prefecture and is the prefecture's westernmost point. The islets are the peaks of a submarine volcano.

submarine volcano

submarine volcano in Vanuatu