Definition: Infralittoral is a term in oceanography that refers to areas of the ocean where water temperature, salinity, and dissolved oxygen levels are low. These regions can be found at high elevations or near the bottom of the ocean, such as at the base of deep-sea trenches or along the margins of continental shelves. The term "infralittoral" is often used to describe areas with a highly dynamic environmental system that is not easily accessible from the surface.