The deposition of a long, winding ridge of sand and gravel by a river of meltwater flowing within or beneath a glacier, which leaves the sediment-filled channel standing as a raised landform once the surrounding ice melts away. Eskers can extend for many kilometres and trace the former path of subglacial drainage.
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Sources
1. Esker (Wikipedia)
Wikipedia infobox 'Lead section' = 'An esker, eskar, eschar, or os (sometimes called an asar, osar, or ...' on 'Esker'View the Source 2. Esker - Wikipedia
Geology sectionQuote, Geology section
Most eskers are argued to have formed within ice-walled tunnels by streams that flowed within and under glaciers.
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