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Almost all the oceans have sheer drops and rather flat areas so one isn't inherently steeper then another. however the largest and steepest drop would most likely be in the Mariana trench, more specifically the challenger deep the deepest part of the trench, it is effectively a 90 degree drop nearly 7 miles deep.

This trench is located in the Pacific Ocean so that would have to be my answer

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15y ago

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