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Gap (landform)
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Low point in a ridge or line of hills

A gap is a geological formation that is a low point or opening between hills or mountains or in a ridge or mountain range. It may be called a col, notch, pass, saddle, water gap, or wind gap. Geomorphologically, a gap is most often carved by water erosion from a freshet, stream or a river. Gaps created by freshets are often, if not normally,...

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