Ocean Zones & Ecosystems

🌊

Continental Shelf

The submerged extension of a continent - shallow, productive, and where 95% of global fish catches o...

0-200m Sunlight

🏞️

Freshwater Rivers (Lotic)

Flowing freshwater systems - streams, creeks, and rivers - where current shapes every aspect of fish...

0-200m Sunlight

🗻

Seamounts

Underwater volcanic mountains rising from the sea floor - biological oases in the deep sea, concentr...

100-4,000m Twilight Deep sea vent

🌋

Hydrothermal Vents

Deep-sea volcanic fissures where superheated, mineral-rich water erupts from the sea floor - hosting...

1,500-4,000m None Deep sea vent

🕳️

Cave & Subterranean Waters

Underground aquifer, cave stream, and cenote systems - dark, isolated waters that generate blind, pi...

0-1,000m None

🌅

Freshwater Lakes (Lentic)

Still or slow-moving freshwater bodies - from puddles to Lake Baikal - each with characteristic ther...

0-1,700m Sunlight

🧊

Cold-Water Coral Reef

Deep-sea coral reefs in cold, dark water - Norway's Lophelia reefs and their global cousins hosting...

200-3,000m None Coral reef

⛰️

Continental Slope

The steep drop-off from continental shelf to abyssal plain - transitional zone where deep-water fish...

200-4,000m Twilight

🪸

Coral Reef

Coral reef ecosystems - the ocean rainforest, hosting 25% of all marine species on less than 1% of t...

0-100m Sunlight Coral reef

🌾

Estuary

Where rivers meet the sea - brackish, nutrient-rich, and vitally important as nurseries for 75% of c...

0-30m Sunlight Estuary

🏝️

Neritic Zone

The productive, sunlit waters above the continental shelf - hosting 90% of the worlds commercial fis...

0-200m Sunlight

⬆️

Upwelling Zones

Coastal areas where deep cold water rises to the surface, bringing nutrients - responsible for the w...

0-200m Sunlight

🪸

Coral Reef Types Deep

The major coral reef types - fringing, barrier, atoll - each with distinct geological history and bi...

0-40m Sunlight Coral reef

🪸

Intertidal Zone

The shoreline zone exposed at low tide and submerged at high tide - the most physically stressful ma...

0-5m Sunlight Rocky shore

🌱

Mangrove Estuary

Tropical coastal forests where salt-tolerant mangrove trees create nursery habitat for reef fish, sh...

0-10m Sunlight Mangrove

🌾

Salt Marsh

Tidal wetlands dominated by salt-tolerant grasses - critical nursery habitat, storm buffer, and carb...

0-2m Sunlight Estuary

🌿

Seagrass Meadow

Underwater meadows of true flowering seagrasses - critical habitat for sea turtles, manatees, seahor...

0-40m Sunlight Seagrass meadow

🦆

Wetlands

Land areas seasonally or permanently saturated with water - marshes, swamps, bogs, and fens - critic...

0-5m Sunlight Estuary

🌿

Kelp Forest

Underwater forests of giant kelp - among the most productive ecosystems on Earth, along temperate ro...

2-40m Sunlight Kelp forest

🪸

Mesophotic Coral Reef

The dimly-lit coral reef zone below traditional shallow reefs - refugia from warming and disease, wi...

30-150m Twilight Coral reef

☀️

Epipelagic Zone

The sunlit surface layer of the ocean - the productive zone where photosynthesis drives marine food...

0-200m Sunlight

🌊

Oceanic Zone

The open ocean waters beyond the continental shelf - vast, low-productivity blue water hosting migra...

0-200m Sunlight

☀️

Photic vs Aphotic Zones

The critical boundary at approximately 200m where enough sunlight fails to support photosynthesis -...

0-200m Sunlight

🌿

Sargasso Sea (Gyre)

The only sea without land borders - the still centre of the North Atlantic Gyre, defined by drifting...

0-200m Sunlight

🌗

Mesopelagic Zone

The twilight zone - dim, cold, and one of the largest habitats on Earth, home to bioluminescent hunt...

200-1,000m Twilight

🌑

Bathypelagic Zone

The midnight zone - eternally dark, cold, and pressurized. Bioluminescence is the only light. Home t...

1,000-4,000m Midnight

⚫

Abyssal Plain

The vast flat regions of the deep sea floor - 4,000-6,000 m deep and covering more of Earth's surfac...

3,000-6,000m None

⚫

Abyssopelagic Zone

The abyss - 4-6 km below the surface, near-freezing, crushing pressure. Life is rare, ancient, and s...

4,000-6,000m None

⛓️

Deep-Sea Trenches

The deepest scars in the ocean floor - Mariana, Tonga, Kermadec trenches - reaching 11 km depth and...

6,000-11,000m None

⚓

Hadal Zone

Ocean trenches deeper than 6000m - the deepest habitats on Earth, including the Mariana Trench at 11...

6,000-11,000m None