caldera
/kælˈdɛrə/
noun
- A large, bowl-shaped depression in the ground that forms when a volcano erupts and collapses.
- The hikers stood at the edge of the ancient caldera and looked down into the valley.
- Scientists study the caldera to understand the volcano's eruption history.
- The lake inside the caldera was a brilliant blue, surrounded by steep cliffs.
Synonyms