crater lake

When rainwater or groundwater accumulates in the crater (or caldera) of a dormant or extinct volcano, it is called a crater lake or caldera lake. Perhaps the best-known example is in Crater Lake National Park in Oregon, formed partly by explosive eruptions and mainly by subsidence of the magma at the top of a composite volcano. Crater Lake’s Wizard Island is a small volcanic cone with a crater at its summit.

Kim Barnes