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What is the flattest part of the ocean floor?

Answer:
The abyssal plains are flat or very gently sloping areas of the deep ocean floor. They are among the Earth's flattest and smoothest regions and the least explored. Abyssal plains generally lie between the foot of a continental rise (shelf) and a mid-oceanic ridge.
First answer by ID2902676499. Last edit by Dfoofnik. Contributor trust: 2556 [recommend contributor recommended]. Question popularity: 2 [recommend question].