Distinctive Landforms of Atlantic and Gulf Coastal Plains: Barrier Islands, Estuaries, and Mangroves

Atlantic Coastal Plain Landmarks

• Barrier Islands – Long, narrow sand/gravel islands parallel to shore (e.g., Outer Banks).
• Estuaries – Drowned river valleys where fresh and salt water mix (e.g., Chesapeake Bay).
• Fjords – Glacial U-shaped inlets with steep cliffs (e.g., Maine coast).
• Salt Marshes – Tidally flooded wetlands with salt-tolerant grasses.

Gulf Coastal Plain Landmarks

• Barrier Islands – Similar formation, protect mainland (e.g., Padre Island).
• Chenier Plains – Beach-ridge complexes of sand and shell (Louisiana/Texas).
• Lagoons – Shallow waters behind barrier islands (e.g., Laguna Madre).
• Mangroves – Salt-tolerant trees lining tropical/subtropical shores (Florida, Texas).

These features shape ecosystems, storm protection, and human settlement patterns.