Page "Estuary" Paragraph 6
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These estuaries are semi-isolated from ocean waters by barrier beaches ( barrier islands and barrier spits ).
Formation of barrier beaches partially encloses the estuary with only narrow inlets allowing contact with the ocean waters.
Bar-built estuaries typically develop on gently sloping plains located along tectonically stable edges of continents and marginal sea coasts.
They are extensive along the Atlantic and Gulf coasts of the U. S. in areas with active coastal deposition of sediments and where tidal ranges are less than.
The barrier beaches that enclose bar-built estuaries have been developed in several ways:
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