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Estuaries
Estuaries can be found from the tropics to polar regions. This range of latitude, coupled with a great diversity in tidal height, currents, and the physical shape of bays, means that an estuary can take any of a variety of forms. They can be a shallow lagoon between a barrier island and the mainland. Estuaries can be deep cuts into the bedrock, formed when glaciers ground their way across the land. A bay can be an ancient river valley that was flooded as the sea level rose thousands of years ago.
