The weathered, rotting old posts are still there; slightly askew, but still lined in a row. One fallen, another missing. And nothing connects them — no rails, no mesh, no barbed wire. They are but the remnants of a fence that once was.
The natural question begged is why was there a fence in a wetlands. Most probably it was once coastal grazing land. This is a barrier island and the hydrology is in a constant state of change around the edges; it is not unusual for pastureland to gradually become wetland and vice-versa. It is my guess that a couple of decades ago this would have been fields with cattle wandering about.