Which coastal zone is a grassy, flat area landward of the dunes formed by sand deposition?

• A. Dunes
• B. Barrier Flat
• C. Low Salt Marsh
• D. Lagoons

Answer: (B)

In barrier island systems, a grassy, flat area landward of the dunes formed by sand deposition is called the barrier flat. This zone sits behind the dune line and develops as sand is transported and deposited in that back-beach area during winds and storms, creating a broad, level surface. Grasses move in and stabilize the sandy soil, giving the area a grassy appearance and helping to slow further erosion. It’s distinct from dunes, which are the raised ridges of wind-blown sand; lagoons, which are water-filled channels behind the barrier, and low salt marshes, which are marshy, water-logged zones with salt-tolerant plants typically found closer to or within tidal areas. The barrier flat is the grassy, flat, sandy landward section formed by those deposition processes.