sublittoral

sub·lit·to·ral

1. a. Of or situated near the seashore.
   b. Of or relating to an organism living near or just below the low tide level of a shore.
2. Lying between the low tide line and the edge of the continental shelf or ranging in depth to about 100 fathoms or 200 meters (660 feet).
3. Of or relating to the deeper part of a lake below the area in which rooted plants grow.