(adjective) Continuous submergence of substrate in an estuarine or marine ecosystem; these areas are below the mean low tide. (modified from Cowardin et al., 1979). Compare – Intertidal.

Submerged, not exposed at the lowest tide.

the marine zone below the intertidal zone that remains submerged at low tide; generally only refers to near-shore or coastal areas

the zone of the shoreline that is below low tide and is always covered by water.

Waters below the low tide mark.

refers to the area below low tide or to sediments deposited in that area.

the coastal life zone that remains underwater (below low tide), but above the continental shelf.(back)

Areas in shallow coastal areas which are below the low tide mark.

A marine or estuarine environment that lies below mean low water; always (or almost always) submerged in a tidally-influenced area.

Below the ebb and flow of the tide. Used to refer to the marine environment below mean lower low tide.

Below the level of mean lower low tide (MLLT).

Below the low tide line, submerged virtually continuously; contrasts with intertidal, which is the area intermittently submerged.