hydrographic feature undersea feature TGN:23195 TGN:23194 flat Geonames:PLFU TGN:23193 FTT:1020 TGN:23192 Geonames:U.PLTU Geonames:U.TERU ridges undersea plain ramp (seafloor) Geonames:U.VALU hole (seafloor) FTT:5 shelf edge A hydrographic feature which is located below the surface of a marine water body. TGN:23118 TGN:23117 TGN:23116 undersea shelf valley Geonames:U.LDGU undersea pinnacle TGN:23196 Geonames:U.GAPU basin Geonames:U.SPRU Geonames:U.SILU forks FTT:1137 Geonames:U.FURU undersea ramp undersea saddle TGN:23001 Geonames:U.GLYU Geonames:MDVU undersea fracture zone undersea median valley undersea sill Geonames:RMPU undersea platform TGN:23212 TGN:23211 TGN:23453 FTT:1194 TGN:23184 undersea ledge FTT:1193 TGN:23183 Geonames:U.ESCU TGN:23182 FTT:1196 Geonames:U.VLSU TGN:23181 FTT:1195 undersea cliff ramp EcoLexicon:fan Geonames:U.RDGU FTT:810 undersea moat Geonames:U.SDLU undersea furrow undersea tongue undersea bank TGN:23467 undersea slope TGN:23463 TGN:23188 gap TGN:23461 gully plain Geonames:U.LEVU furrow escarpment platform TGN:23431 TGN:23550 undersea terrace ridge Geonames:U.RISU saddle TGN:23162 ledge Geonames:U.SHVU FTT:1176 Geonames:U.BSNU undersea levee Geonames:U.HOLU Geonames:U.EDGU province fork undersea shelf edge Geonames:U.PLNU Geonames:U.FLTU hole Geonames:U.FANU undersea gap EcoLexicon:platform fan rise Geonames:U.PRVU EcoLexicon:ravine rise (seafloor) FTT:984 ravine median valley plateau TGN:23415 undersea valley TGN:23413 undersea peak TGN:23412 TGN:23411 TGN:23135 pinnacle Geonames:RAVU undersea rise Geonames:FRSU Geonames:U.RDSU undersea bench moat (seafloor) undersea spur Geonames:FRKU TGN:23424 levee TGN:23423 TGN:23301 undersea fork undersea fan TGN:23421 Geonames:U.PNLU undersea hole undersea shelf undersea basin