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plural calderas
(volcanology) A large crater formed by collapse of the cone or edifice of a volcano. quotations
The lakes of both Rotorua and Taupo occupy calderas left from enormous prehistoric eruptions, and magma lies at shallow depths beneath a number of centres.
2000, Tony Waltham, “Geyser watching”, in Geology Today, volume 16, Iss. 3, p. 99: