A sand dune located at the front or foremost position of a series of dunes, typically closest to the water.
From 'fore-' (front, first) + 'dune' (from French 'dune,' from Dutch 'duin'). The term became standard in coastal geography and ecology.
Foredunes are nature's first line of defense against storms and erosion—ecologists have discovered that protecting these 'sacrificial' dunes actually saves entire coastlines by absorbing the initial wave energy.
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