Are the Florida Keys natural or manmade?

They are island remnants of ancient coral reefs (Upper Keys) and sand bars (Lower Keys) that flourished during a period of higher sea levels approximately 125,000 years ago (a period of geologic time known as the Pleistocene Epoch).



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Why is the Florida Keys water so blue? The light blue line south and east of the islands is a living coral reef system—among the largest in the world. Deeper water beyond the edge of the Florida platform appears dark blue. Many of the Florida Keys fall within the boundaries of national parks.

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Waste water is treated to advanced standards and discharged into a deep injection well located on the plant site. The treatment plant was constructed in 1989; designed and permitted to produce secondary quality effluent at a rate of 10 million gallons per day ( MGD ).

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HABs can lead to discoloration (red, brown or green tides) of the water as large numbers of algae accumulate. Some HAB-causing algae can release toxins that can lead to fish kills, coral stress and mortality and skin and respiratory problems in humans.

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The 7 Best Islands In the Florida Keys, Florida
  • Key West. Key West is one of the most coveted places for beach holidays in the Florida Keys. ...
  • Little Torch Key. This Florida Key is one of the best-kept secrets in the United States. ...
  • Big Pine Key. ...
  • Key Largo. ...
  • Long Key. ...
  • Duck Key. ...
  • Marathon Key.


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Sombrero Beach, Marathon Sombrero ranks at the top of the list of best beaches in the Florida Keys. In fact, in 2023 Sombrero was the only South Florida beach to make the “best beaches in the US” list on TripAdvisor.

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The pristine waters of the Lower Keys highlights the area's stunning natural beauty. The 125-mile Florida Keys island chain is home to the continental United States' only living-coral barrier reef, which runs the length of the Keys about five miles offshore.

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Largest of the keys is Key Largo, about 30 miles (50 km) long and formerly known for its plantations of key limes (used to make key lime pies).

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The story has it that due to Hurricane Donna in 1960 all types of household debris was scattered across the island and in its waters. In the aftermath on Donna, one toilet seat was found hanging on one of the homemade posts marking this unofficial channel.

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You can also swim and enjoy other water sports like windsurfing and snorkeling as well as kayaking and paddleboarding in the clear, clean water inhabited by tropical fish.

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Calusa Beach is another popular option in the Keys. It's located within Bahia Honda State Park, between Big Pine Key and Marathon, on the Gulf side, which means its waters are sheltered and calm. The gentle Gulf is great for families with children who want to swim.

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Florida Keys Could Be Underwater by 2025.

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The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.

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