behind the seawall,
seawalls are big berms of smooth beach rocks pushed up by storm waves commonly found along the coasts of maine and the maritimes. They tend to get bigger the farther down east you go probably due to the higher tides. they often have a pond, bog or, at most, a damp spot behind them as the runoff and seawater from storms has trouble draining out. this one is on great spruce head island in penobscot bay.