Eskers are produced as a result of running water in, on or under the glacier. They are linear mounds of sand and gravel that commonly snake their way across the landscape. They are the deposits of rivers and streams that flowed on, in or under a glacier . When the glacier retreats the sediment that had been deposited in the channel is lowered to the land surface where it forms a linear mound, or hill, that is roughly parallel to the path of the original glacial river.

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