Mar Chiquita, or Little Sea, is a small beach in a protected cove near the eastern end of a long rocky wall exposed on the coast of Manatí in northern Puerto Rico, about 40 kilometers west of San Juan. The oval shaped beach lies behind the rocky wall in a small cove protected from the rough Atlantic. The wall was breached by the action of waves to form a 25 meter opening where the tide entered and formed a bay in the shape of the English alphabet U. The waves inside the cove is of considerable height as the result of the backwash meeting the incoming waves at their breaking point, building up the size of the waves.

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