Last Updated
：2025/11/23
abyssal plain
（ plural ）
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a large expanse of very flat and smooth ocean floor, usually found at depths of 4,600 to 5,500 meters (15,000 to 18,000 feet).
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abyssal plain
The research team deployed deep-sea probes to map life forms scattered across the abyssal plain.
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The research team deployed deep-sea probes to map life forms scattered across the abyssal plain.
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