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San Joaquin is a forested
basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...
ic
shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more v ...
forming the southeastern corner of
Equatorial Guinea Equatorial Guinea ( es, Guinea Ecuatorial; french: Guinée équatoriale; pt, Guiné Equatorial), officially the Republic of Equatorial Guinea ( es, link=no, República de Guinea Ecuatorial, french: link=no, République de Guinée équatoria ...
's
Bioko Island Bioko (; historically Fernando Po; bvb, Ëtulá Ëria) is an island off the west coast of Africa and the northernmost part of Equatorial Guinea. Its population was 335,048 at the 2015 census and it covers an area of . The island is located of ...
. Its summit contains a small lake-filled
caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...
and its northeastern flank is home to a
crater lake Crater Lake (Klamath language, Klamath: ''Giiwas'') is a volcanic crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity. The ...
. The geologic history of San Joaquin is poorly known but the
International Association of Volcanology and Chemistry of the Earth's Interior The International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) is a learned society that focuses on research in volcanology, efforts to mitigate volcanic disasters, and research into closely related disciplines, such a ...
has classified the volcano as having been active in the last 2,000 years.


See also

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List of volcanoes in Equatorial Guinea This is a list of active and extinct volcanoes in Equatorial Guinea. References {{Global Volcanism Program Equatorial Guinea Volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows ...


References

Shield volcanoes of Equatorial Guinea Polygenetic shield volcanoes Calderas of Equatorial Guinea {{EquatorialGuinea-geo-stub