An esker is a long, steep-sided, narrow ridge of coarse gravel deposited by a stream flowing in or under a decaying sheet of glacial ice, usually found in an open channel. They are created when sediment that has been deposited comes in contact with the glacial ice. Eskers are generally straight, but vary by having either flat tops or sharp crests. Most eskers are about 50-80 meters (164-262 feet) high with widths usually less than 150 meters (492 feet).
Eskers are only found in areas that were once covered in glaciers. They are common in northern Canada with the largest eskers located northern Quebec, Victoria Island, and the western Canadian Shield. They often resemble the drainage patterns of rivers and streams since they are created by glaciers' meltwater that runs across the surface.
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