Answer: sublittoral

AnswerCrossword Clue
sublittoralRelating to or denoting a biogeographic zone extending (in the sea) from the average line of low tide to the edge of the continental shelf or (in a large lake) beyond the littoral zone but still well lit
sublittoralthe area lying between the shoreline and the edge of the continental shelf
sublittoral(of a marine animal, plant, or deposit) Living, growing, or accumulating near to or just below the shore