The deepest portions of the ocean are part of the relatively narrow features called submarine canyons.

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The deepest portions of the ocean are found in oceanic trenches, not submarine canyons. Submarine canyons are indeed deep and steep-sided valleys cut into the sea floor of the continental slope, sometimes extending well onto the continental shelf, but the deepest parts of the ocean are located in trenches formed by tectonic activity.

The Deepest Portions of the Ocean Are Part of the Relatively