part of adjacent to marine supra-littoral zone marine littoral zone marine sub-littoral zone marine eulittoral zone intertidal zone midlittoral zone foreshore mediolittoral zone The eulittoral zone extends from the spring high tide line, which is rarely inundated, to the spring low tide line, which is rarely not inundated. The wave action and turbulence of recurring tides shapes and reforms cliffs, gaps, and caves, offering a huge range of habitats for sedentary organisms. marine environmental zone