
An abyssal hill is a small hill that rises from the floor of an abyssal plain. They are the most abundant geomorphic structures on the planet Earth, covering more than 30% of the ocean floors. Abyssal hills have relatively sharply defined edges and climb to heights of no more than a few hundred meters. They can be from a few hundred meters to kilo...
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http://en.wikipedia.org/wiki/Abyssal_hill

small, topographically well-defined submarine hill that may rise from several metres to several hundred metres above the abyssal seafloor, in water ... [1 related articles]
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http://www.britannica.com/eb/a-z/a/9
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