marine sub-littoral zone 2010-03-17T09:01:45Z ENVO ENVO:01000126 ORCID:0000-0002-4366-3088 The marine sublittoral zone is part of the marine littoral zone which is permanently covered by seawater. In physical oceanography, the sublittoral zone refers to coastal regions with significant tidal flows and energy dissipation, including non-linear flows, internal waves, river outflows and oceanic fronts. In practice, this typically extends to the edge of the continental shelf, with depths around 200 meters. In marine biology, the sublittoral refers to the areas where sunlight reaches the ocean floor, that is, where the water is never so deep as to take it out of the photic zone. marine sublittoral zone sublittoral zone environmental zone