Sea Rim refers to that portion of the Gulf shoreline where marsh grasses meet the surf. These marshlands formed when silt from the Sabine River delta was carried down the beach by longshore currents. A unique environment, Sea Rim provides a valuable habitat for many wetland species.
I believe this was the NASTIEST beach on earth. There were mudflats on the beach and tons of thick black dirt and trash. UGH. We did go on a cool airboat ride in the marshes with a genius Ranger though.