"Florida's east coast is lined with long, thin islands — from Cape Canaveral to Miami Beach. They're called barrier islands, and they're the first line of defense between the ocean and the mainland. Without them, there would be no lagoon, no beach towns, no protection from hurricanes. But how did they get there?"
What Are Barrier Islands?
Barrier islands are long, narrow islands that run parallel to the mainland coast, separated from it by a lagoon, bay, or sound. Florida's Atlantic coast is lined with barrier islands — some famous (Miami Beach, Palm Beach, Cocoa Beach), others less known. These islands are dynamic, constantly shaped by waves, tides, and storms. They serve as a natural buffer: they absorb the energy of ocean waves, protect the mainland from storm surge, and create the sheltered lagoon waters behind them. Without barrier islands, the Indian River Lagoon would not exist — it is the body of water between the barrier islands and the mainland. Understanding how these islands formed is understanding how the entire lagoon system came to be.
