Which area is defined as part of the sea shore that is always submerged?

The littoral zone is accurately defined as the part of the sea shore that is always submerged under water. Unlike areas that may be exposed to air during low tide, the littoral zone remains consistently underwater, contributing to the unique biodiversity and ecological dynamics found in this environment. This zone often contains various marine life, including seaweeds, corals, and numerous fish species that thrive in stable underwater conditions.

In contrast, the intertidal zone is the area that alternates between being submerged and exposed, depending on the tide. Submarine canyons are underwater valleys typically found on the continental shelf which do not specifically describe a shoreline area, while the abyssal zone refers to the very deep parts of the ocean floor, which are far removed from the shoreline context. Understanding these distinctions helps clarify the specific characteristics that define different marine zones.