Karst i isbreer er hulrom i breen som dannes når smeltevann drenerer. Prosessen er i store trekk lik det som skjer når vann danner grotter i kalkholdig berg på land. Hulrommene har en rekke navn, etter form og plassering: brønner, kaskader, kanaler, korridorer, kamre og fjærer.
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