How was Biscayne Bay formed?

Biscayne Bay formed as sea level rose to fill a depression in the limestone between 5,000 and 2,400 years ago. During and since that time sandy barrier islands, banks of carbonate sand and mud, and coastal wetland swamp and marsh deposits have grown and evolved to give the bay its present form.



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The bay was named for either the Bay of Biscay, which is part of the Atlantic Ocean north of Spain, or an early explorer called El Biscaino, who came from the Spanish province of Biscaya.

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Biscayne National Park is 95% underwater and 100% worth preserving, protecting and restoring. When people envision Florida's coasts, the gentle waves lapping at the soft sand under a bright sun generally come to mind, but the greatest things our waters have to offer are actually found under the surface.

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MIAMI-DADE ( October 19, 2023 )– Based on compliant water sampling results, all waters surrounding Virginia Key and Key Biscayne – except for Crandon Beach North and South – are no longer subject to the no-swim advisory and signage has been removed.

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