1) Benthal 2) Benthic 3) Biogeographical region 1) Benthal 2) Benthic 
benthic, benthonic 1. Pertaining to the sea bed, river bed, or lake floor. 2. The collection of organisms living on or in sea or lake bottoms. A reference to benthos; from Greek, meaning 'depth'; which designates the oceanic substratum. Benthic refers to the fauna living on the bottom, in contrast to the pelagic fauna, which live in the open oce...