"cirque : (geology) A curved depression in a mountainside with steep walls, forming the end of a..."

“cirque : (geology) A curved depression in a mountainside with steep walls, forming the end of a valley.
(dated or literary) Something in the shape of a circle or ring, such as a Roman circus.
The Canadian entertainment company Cirque du Soleil was founded on this day in 1984.”

- https://en.wiktionary.org/wiki/cirque#English

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