cirque(redirected from Sirque)
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Related to Sirque: cirque
a natural bowl-shaped depression near the summit of a mountain, with steep rocky walls and a sloping concave bottom. It is formed by the action of small glaciers, snow fields, and subsequent frost weathering. Some cirques have permanent glaciers or firn accumulation; others have seasonal accumulations of snow, and very often the cirque bottom is filled with water(high-mountain lakes).