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Seabed

Aleutian Trench
An oceanic trench along the southern coastline of Alaska and the Aleutian islands
Belize Barrier Reef
Series of coral reefs straddling the coast of Belize
Bermuda Pedestal
Geological feature in the North Atlantic Ocean
Central Indian Ridge
A north-south-trending mid-ocean ridge in the western Indian Ocean
Challenger Deep
Deepest known point in the Earth's seabed hydrosphere
Chile Ridge
An oceanic ridge at the tectonic divergent plate boundary between the Nazca and Antarctic plates
Doggerland
Land mass now beneath the southern North Sea that connected Britain to mainland Europe
East Pacific Rise
A mid-oceanic ridge at a divergent tectonic plate boundary on the floor of the Pacific Ocean
Great Barrier Reef
Coral reef system located in the Coral Sea
Hawaiian–Emperor seamount chain
A mostly undersea mountain range in the Pacific Ocean that reaches above sea level in Hawaii.
Izu–Bonin–Mariana arc
Convergent boundary in Micronesia
Mariana Trench
The deepest oceanic trench on Earth
Mid-Atlantic Ridge
Atlantic Ocean tectonic plate boundary
Nankai Trough
Submarine trough located south of Japan's island of Honshū
Pacific–Antarctic Ridge
Tectonic plate boundary in the South Pacific Ocean
Southwest Indian Ridge
A mid-ocean ridge on the bed of the south-west Indian Ocean and south-east Atlantic Ocean
Yonaguni Monument
Submerged rock formation off the coast of Japan