Where fresh water meets tidal, water from the ocean.
The Atlantic is about 15 miles (24 k) from here and runs through large marshes. The other side here is behind an old dike, originally for rice plantations.
Water moves in, and out, through a series of wooden trunks dotted along the coastal areas. And Alligators like fresh water, so here they sit.
Oh, fish are pushed through also depending on the tide shift. A convenient place to eat too.