mountain seamount A mountain rising from the ocean seafloor that does not reach to the water's surface (sea level), and thus is not an island. Typically formed from volcanoes that rise abruptly and are usually found rising from a seafloor of 1,000 - 4,000 meters depth. Independent features that rise to at least 1,000 meters above the seafloor. ENVO ENVO:00000264 EcoLexicon:mountain EcoLexicon:seamount FTT:1241 Geonames:MTSU Geonames:RNGU Geonames:U.HLLU Geonames:U.HLSU Geonames:U.KNLU Geonames:U.KNSU Geonames:U.MESU Geonames:U.MNDU Geonames:U.MTU Geonames:U.PKSU Geonames:U.PKU Geonames:U.SMSU Geonames:U.SMU Seamount TGN:23132 TGN:23133 TGN:23172 TGN:23175 TGN:23176 TGN:23178 Wikipedia:Seamount hill hills knoll knolls mesa mound mount mount mountain mountains peak peaks range sea mount sea-mount seaknoll seakpeak seamount submarine volcano undersea hill undersea knoll undersea mound