marine life zones

Epipelagic Zone

Sunlight zone ($0\text{ to }200\,\text{m}$); receives abundant solar illumination and supports the majority of marine life.

Mesopelagic Zone

Twilight zone ($200\text{ to }1{,}000\,\text{m}$); receives very little sunlight, insufficient for photosynthesis.

Bathypelagic Zone

Midnight zone ($1{,}000\text{ to }4{,}000\,\text{m}$); completely dark, icy cold, and under substantial hydrostatic pressure.

Abyssopelagic Zone

Abyssal zone ($4{,}000\text{ to }6{,}000\,\text{m}$); characterized by pitch darkness, near-freezing temperatures, and immense pressure.

Hadalpelagic Zone

Hadal zone ($6{,}000\text{ to }11{,}000\,\text{m}$); the deepest marine realm, found within oceanic trenches and canyons.

Intertidal Zone

The coastal shoreline area exposed to the air at low tide and submerged under water at high tide.

Neritic Zone

The relatively shallow region of marine water located directly above the continental shelf.

Oceanic Zone

The vast region of open water extending beyond the edge of the continental shelf.

Pelagic Zone

The open water column of the ocean, encompassing all depths separate from the shoreline and seafloor.

Benthic Zone

The lowest ecological region of the ocean, comprising the seafloor, sediment surfaces, and bottom-dwelling organisms.

Littoral Zone

The near-shore coastal boundary area extending from the high-water line into shallow coastal waters.

Sublittoral Zone

The continuously submerged marine seabed beginning below the low-tide mark and stretching across the continental shelf.