of or pertaining to the biogeographic region of the ocean bottom between the littoral
and bathyal zones, from the low water line
to the edge of the continental shelf, or to a depth of approximately 660 feet (200 meters).
being or situated in the zone of a lake extending from the lowest depth of rooted photosynthetic plants to the level at which
the photosynthetic rate of flora equals the respiration rate.
a sublittoral zone or region.