A ribbon lake is a long, narrow, finger-shaped lake which is usually found in the glacial trough.


Certain parts of the valley are more likely to be eroded due to there being bands of hard (resistant) rock and soft (less resistant) rock. The boulders carried by the bottom of the glacier will erode the soft rock more quickly by abrasion, creating a rock basin. The more resistant rock will erode more slowly, creating rock bars, which act as dams between which rainwater and meltwater may accumulate after the ice age to form a ribbon lake.


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