"FTT:421"^^ . _:b1216481 . . "undersea ravine"^^ . "SubmarineCanyon"^^ . _:b1216480 . "A steep-sided valley on the sea floor of the continental slope. Many submarine canyons are found as extensions to large rivers; however there are many that have no such association. Canyons cutting the continental slopes have been found at depths greater than 2 km below sea level. Many submarine canyons continue as submarine channels across continental rise areas and may extend for hundreds of kilometers."^^ . "submarine canyon"^^ . "ENVO"^^ . _:b1216480 . "undersea canyon"^^ . "TGN:23415"^^ . _:b1216480 . . "Geonames:U.CNYU"^^ . _:b1216481 . _:b1216480 . _:b1216481 . "Geonames:U.CNSU"^^ . "EcoLexicon:submarine_canyon"^^ . "TGN:23416"^^ . "ENVO:00000267"^^ . _:b1216481 . "Wikipedia:Submarine_canyon"^^ . "canyons"^^ . "canyon"^^ .