The Bear Seamount (left), a guyot in the northern Atlantic Ocean

In marine geology, a guyot (pronounced /), also known as a tablemount, is an isolated underwater volcanic mountain (seamount) with a flat top more than 200 m (660 ft) below the surface of the sea. The diameters of these flat summits can exceed 10 km (6.2 mi).[1] Guyots are most commonly found in the Pacific Ocean, but they have been identified in all the oceans except the Arctic Ocean.


Guyots were first recognized in 1945 by Harry Hammond Hess, who collected data using echo-sounding equipment on a ship he commanded during World War II.[2] His data showed that some undersea mountains had flat tops. Hess called these undersea mountains "guyots", because they resembled the flat-roofed biology and geology building at Princeton University, Guyot Hall, named after the 19th-century geographer Arnold Henry Guyot.[3][failed verification] Hess postulated they were once volcanic islands that were beheaded by wave action, yet they are now deep under sea level. This idea was used to help bolster the theory of plate tectonics.[2]

Other Languages
العربية: جيوت
asturianu: Guyot
català: Guyot
čeština: Guyot (hora)
Deutsch: Guyot
eesti: Gaiot
español: Guyot
Esperanto: Gujoto
euskara: Guiot
galego: Guyot
한국어: 평정해산
italiano: Guyot
қазақша: Гайот
lietuvių: Gajotas
Nederlands: Guyot (berg)
日本語: ギヨー
norsk: Guyot
norsk nynorsk: Guyot
polski: Gujot
português: Guyot
русский: Гайот
Simple English: Guyot
svenska: Guyot
татарча/tatarça: Гайот
Türkçe: Guyot
українська: Гайот
Winaray: Guyot