Barrier Islands Aren't Just on the US East Coast—They're Global
Correction: Barrier islands exist on **both US coasts and worldwide**—not just the East Coast.
US Distribution
| Coast | Major Chains | Length |
|---|
| Atlantic / Gulf (East + Gulf) | Outer Banks (NC), Sea Islands (GA/SC), FL Keys (coral), TX barrier chain (Padre, Mustang, Galveston) | ~3,000 km |
| Pacific (West) | Channel Islands (CA), Long Beach Peninsula (WA), Oregon Dunes (barrier spits), Alaska barrier islands (Arctic) | ~500 km (lower 48) |
Global Examples
- Wadden Sea (NL/DE/DK) — UNESCO, 50+ islands
- Fraser Island (AU) — World's largest sand island (1,840 km²)
- Sable Island (CA) — Crescent dune, wild horses
- Curonian Spit (LT/RU) — 98 km dune peninsula
- Lagoa dos Patos barriers (BR) — Longest continuous barrier system (600 km)
Formation Requirements (Universal)
- Sediment supply (longshore drift)
- Low-to-moderate tidal range (<4 m ideal)
- Gently sloping shoreface
- Relative sea-level stability or slow rise
- Wave energy to rework sediment
Why the East Coast Bias?
- US population historically concentrated on Atlantic/Gulf
- Long, continuous chains (Outer Banks → Texas) vs. fragmented Pacific
- Early tourism & development (Atlantic City, Miami Beach, Galveston)
Barrier islands are **coastal morphology, not regional exclusive**. Where physics permits, they form.
Wanderlust World