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Coastal natural bars, or barrier bars, are formed through the accumulation of sand and sediment along shorelines by the action of waves, currents, and tides. As waves approach the shore and lose energy, they deposit sand, which can gradually build up to create a barrier parallel to the coastline. These formations can also be influenced by longshore drift, where sediment is transported along the coast. Over time, the accumulation can lead to the creation of lagoons or sheltered water bodies behind the bar.

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