intertidal zone ENVO ENVO:00000316 EcoLexicon:intertidal_zone FTT:240 FTT:501 IntertidalZone SPIRE:Intertidal SWEETRealm:IntertidalZone The area of the foreshore and seabed that is exposed to the air at low tide and submerged at high tide, i.e., the area between tide marks. Very similar to the "marine eulittoral zone" class, but without reference to seasonal tide marks. Some sources make no distinction between these zones, thus, they are currently related synonyms. Wikipedia:Intertidal_zone coastal zone littoral zone environmental zone