Ambitle is a

volcanic island Geologically, a volcanic island is an island of volcanic origin. The term high island can be used to distinguish such islands from low islands, which are formed from sedimentation or the uplifting of coral reefs (which have often formed ...

which, together with Babase, another volcanic island, is one of the two

Feni Islands The Feni Islands are an island group in New Ireland Province, Papua New Guinea, located east of New Ireland, at . It is a part of the Bismarck Archipelago. The larger island of the group is Ambitle, the other island is Babase Island Babase Isl ...

in the

Bismarck Archipelago The Bismarck Archipelago (, ) is a group of islands off the northeastern coast of New Guinea in the western Pacific Ocean and is part of the Islands Region of Papua New Guinea. Its area is about . History The first inhabitants of the archipela ...

. The island is located within the

Papua New Guinea Papua New Guinea, officially the Independent State of Papua New Guinea, is an island country in Oceania that comprises the eastern half of the island of New Guinea and offshore islands in Melanesia, a region of the southwestern Pacific Ocean n ...

New Ireland Province New Ireland Province, formerly New Mecklenburg (), and Nova Hibernia, is the northeasternmost Provinces of Papua New Guinea, province of Papua New Guinea. Physical geography The largest island of the province is New Ireland (island), New Irelan ...

, to the east of the island of New Ireland. Ambitle is a

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

, reaching above sea level. It last erupted in about 350 BCE based on

radiocarbon dating Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for Chronological dating, determining the age of an object containing organic material by using the properties of carbon-14, radiocarbon, a radioactive Isotop ...

. Its

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the str ...

, wide, contains thermal areas on its western side. Venting of hydrothermal water also occurs in

coral reef A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in group ...

s to the west of this island. AmbitleTopography

References

Further reading