Florida Keys: What "Keys" Actually Means
In "Florida Keys," key (from Spanish cayo, from Taíno cayo = small island) refers to the ~1,700 low-lying coral islands forming a 120-mile arc from Soldier Key (Biscayne Bay) to the Dry Tortugas.
Geological Origin
- Ancient coral reefs (Key Largo Limestone, Miami Limestone) exposed by falling sea levels (~125,000 years ago)
- Not volcanic or continental—pure carbonate sediment
- Max elevation: ~18 ft (Windley Key); most <5 ft
Key Groups
- Upper Keys: Key Largo, Islamorada, Long Key – largest, most developed
- Middle Keys: Marathon, Seven Mile Bridge, Pigeon Key
- Lower Keys: Big Pine Key (Key deer), Bahia Honda, Key West
- Dry Tortugas: 70 mi west; Fort Jefferson, pristine reefs, accessible only by boat/seaplane
Overseas Highway (US-1)
42 bridges (including 7-mile link) connect the main keys. Engineering marvel (1938, on Flagler's railroad bed). Drive time: ~3.5 hrs Key Largo → Key West.
Ecological Significance
- Only living coral barrier reef in continental US
- Critical habitat: Key deer, Lower Keys marsh rabbit, Miami blue butterfly
- Vulnerable: sea level rise, storms, coral bleaching, overdevelopment
"Key" = coral island. The Keys = a fragile, unique archipelago where Caribbean meets North America.
Wanderlust World