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seamount Isolated, submarine mountain rising more than 1000 m above the ocean floor. The sharp, crested summits of seamounts are usually 1000–2000 m below the ocean surface. Seamounts are of volcanic origin. They are increasingly coming under study with modern methods of submarine acoustic imagery, e.g. GLORIA (Geological LOng Range Inclined Asdic) side-scan sonar. See also GUYOT.