The Blue Hole on Big Pine Key was an abandoned rock quarry used for road fills for the Flagler Overseas Railroad.

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Big Pine Key
Florida
Florida keys
Monroe County
National Key Deer Refuge
National Key Deer Refuge National Wildlife Refuge
The Blue Hole
periphyton
rock quarry

The Blue Hole on Big Pine Key was an abandoned rock quarry used for road fills for the Flagler Overseas Railroad.


The Blue Hole

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