Florida Guide Florida regions, islands, and historic-city planning

Islands and the sea

Islands, the Keys, and the maritime edge

Florida is defined as much by its edges as its interior - a peninsula rimmed by barrier islands and trailing off into the Florida Keys, an archipelago that curves into the Gulf and Caribbean. Wrecking, fishing, lighthouses, and shelling built the island culture, and that maritime frontier still gives the Keys, Sanibel, and the Gulf islands their distinct character.

Last checked July 12, 2026

The Keys and the wrecking coast

The Florida Keys arc more than a hundred miles from the mainland toward the Dry Tortugas, closer in feel to the Caribbean than to the rest of the state. In the nineteenth century Key West grew wealthy on 'wrecking' - salvaging ships that foundered on the treacherous reef offshore - and for a time was one of the richest cities per capita in the country.

Lighthouses like the one at Key West were built to reduce those wrecks, and the reef that caused them is now protected as a national marine sanctuary. The islands' end-of-the-road independence still shapes Key West's Old Town character.

Barrier islands and the shelling coast

Much of Florida's coastline is a fringe of low barrier islands - Amelia in the northeast, Anastasia off St. Augustine, and the Gulf islands of Sanibel, Captiva, and the St. Armands and Lido keys off Sarasota. Sanibel is unusual for its east-west orientation, which acts like a scoop for shells and makes it one of the world's great shelling beaches.

These islands are dynamic and exposed, built and reshaped by storms and currents, which is why so much of their land is protected in state parks and refuges like Fort Clinch, Fort Zachary Taylor, and the Ding Darling refuge.

A working and fragile waterline

The maritime edge is not only scenery. Fishing fleets, sponge and shrimp boats, ports, and mangrove nurseries all depend on the same shallow, warm waters that draw visitors, and those waters are sensitive to storms, red tide, and development.

Understanding Florida as an island-and-estuary state - a thin, sandy rim around a low peninsula - explains both its beauty and its fragility, and why its lighthouses, refuges, and parks cluster where the land meets the sea.

Sources

Reviewed source trail