The deep ocean floor is thought to be fairly flat with

The deep ocean floor is thought to be fairly flat with occasional deeps, abyssal plains, trenches, seamounts, basins, plateaus, canyons, and some guyots. Various shelves along the margins of the continents constitute about 11% of the bottom topography with few deep channels cut across the continental rise.
Ocean floor trenches and seamounts:
Puerto Rico Trench, in the North Atlantic, is the deepest trench at 8,605 metres (28,232 ft)[7]
Laurentian Abyss is found off the eastern coast of Canada
South Sandwich Trench reaches a depth of 8,428 metres (27,651 ft)
Romanche Trench is located near the equator and reaches a depth of about 7,454 metres (24,455 ft).


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