The deepest sea found within swimming distance of a beach is the Mariana Trench, which is located in the Pacific Ocean. Hawaii has some of the deepest drop offs in the world where the eroded shoreline is very close to deep water.
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The bottom of the deep sea has several features that contribute to the diversity of this habitat. The main features are mid-oceanic ridges, hydrothermal vents, mud volcanoes, seamounts, canyons and cold seeps. Carcasses of large animals also contribute to habitat diversity.