A ridge of sediment that is deposited across the mouth of a bay. It is usually attached to the shore at each end. The deposit may be carried to the bar by longshore drift, or it may be carried there by a river. When the bay bar grows large enough it bay completely block the bar from the sea, so that a delta forms on the landward side as further deposits pile up.
Related category GEOGRAPHY
Source: U.S. Geological Survey
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