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Types of underwater objects |
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xlsx date of update: 2024-08-31 10:06:39
quantity: 62
quantity: 62
| Code | Name | Description |
| APNU | Apron | A gentle slope, with a generally smooth surface, particularly found around groups of islands and seamounts |
| ARCU | Arch | A low bulge around the southeastern end of the island of Hawaii |
| ARRU | Arrugado | An area of subdued corrugations off Baja California |
| BDLU | Borderland | A region adjacent to a continent, normally occupied by or bordering a shelf, that is highly irregular with depths well in excess of those typical of a shelf |
| BKSU | Banks | Elevations, typically located on a shelf, over which the depth of water is relatively shallow but sufficient for safe surface navigation |
| BNKU | Bank | An elevation, typically located on a shelf, over which the depth of water is relatively shallow but sufficient for safe surface navigation |
| BSNU | Basin | A depression more or less equidimensional in plan and of variable extent |
| CDAU | Cordillera | An entire mountain system including the subordinate ranges, interior plateaus, and basins |
| CNSU | Canyons | Relatively narrow, deep depressions with steep sides, the bottom of which generally has a continuous slope |
| CNYU | Canyon | A relatively narrow, deep depression with steep sides, the bottom of which generally has a continuous slope |
| CRSU | Continental rise | A gentle slope rising from oceanic depths towards the foot of a continental slope |
| DEPU | Deep | A localized deep area within the confines of a larger feature, such as a trough, basin or trench |
| EDGU | Shelf edge | A line along which there is a marked increase of slope at the outer margin of a continental shelf or island shelf |
| ESCU | Escarpment (or scarp) | An elongated and comparatively steep slope separating flat or gently sloping areas |
| FANU | Fan | A relatively smooth feature normally sloping away from the lower termination of a canyon or canyon system |
| FLTU | Flat | A small level or nearly level area |
| FRZU | Fracture zone | An extensive linear zone of irregular topography of the sea floor, characterized by steep-sided or asymmetrical ridges, troughs, or escarpments |
| FURU | Furrow | A closed, linear, narrow, shallow depression |
| GAPU | Gap | A narrow break in a ridge or rise |
| GLYU | Gully | A small valley-like feature |
| HLLU | Hill | An elevation rising generally less than 500 meters |
| HLSU | Hills | Elevations rising generally less than 500 meters |
| HOLU | Hole | A small depression of the sea floor |
| KNLU | Knoll | An elevation rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summit |
| KNSU | Knolls | Elevations rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summits |
| LDGU | Ledge | A rocky projection or outcrop, commonly linear and near shore |
| LEVU | Levee | An embankment bordering a canyon, valley, or seachannel |
| MESU | Mesa | An isolated, extensive, flat-topped elevation on the shelf, with relatively steep sides |
| MNDU | Mound | A low, isolated, rounded hill |
| MOTU | Moat | An annular depression that may not be continuous, located at the base of many seamounts, islands, and other isolated elevations |
| MTU | Mountain | A well-delineated subdivision of a large and complex positive feature |
| PKSU | Peaks | Prominent elevations, part of a larger feature, either pointed or of very limited extent across the summit |
| PKU | Peak | A prominent elevation, part of a larger feature, either pointed or of very limited extent across the summit |
| PLNU | Plain | A flat, gently sloping or nearly level region |
| PLTU | Plateau | A comparatively flat-topped feature of considerable extent, dropping off abruptly on one or more sides |
| PNLU | Pinnacle | A high tower or spire-shaped pillar of rock or coral, alone or cresting a summit |
| PRVU | Province | A region identifiable by a group of similar physiographic features whose characteristics are markedly in contrast with surrounding areas |
| RDGU | Ridge | A long narrow elevation with steep sides |
| RDSU | Ridges | Long narrow elevations with steep sides |
| RFSU | Reefs | Surface-navigation hazards composed of consolidated material |
| RFU | Reef | A surface-navigation hazard composed of consolidated material |
| RISU | Rise | A broad elevation that rises gently, and generally smoothly, from the sea floor |
| SCNU | Seachannel | A continuously sloping, elongated depression commonly found in fans or plains and customarily bordered by levees on one or two sides |
| SCSU | Seachannels | Continuously sloping, elongated depressions commonly found in fans or plains and customarily bordered by levees on one or two sides |
| SDLU | Saddle | A low part, resembling in shape a saddle, in a ridge or between contiguous seamounts |
| SHFU | Shelf | A zone adjacent to a continent or around an island that extends from the low water line to a depth at which there is usually a marked increase of slope towards oceanic depths |
| SHLU | Shoal | A surface-navigation hazard composed of unconsolidated material |
| SHSU | Shoals | Hazards to surface navigation composed of unconsolidated material |
| SHVU | Shelf valley | A valley on the shelf, generally the shoreward extension of a canyon |
| SILU | Sill | The low part of a gap or saddle separating basins |
| SLPU | Slope | The slope seaward from the shelf edge to the beginning of a continental rise or the point where there is a general reduction in slope |
| SMSU | Seamounts | Elevations rising generally more than 1,000 meters and of limited extent across the summit |
| SMU | Seamount | An elevation rising generally more than 1,000 meters and of limited extent across the summit |
| SPRU | Spur | A subordinate elevation, ridge, or rise projecting outward from a larger feature |
| TERU | Terrace | A relatively flat horizontal or gently inclined surface, sometimes long and narrow, which is bounded by a steeper ascending slope on one side and by a steep descending slope on the opposite side |
| TMSU | Tablemounts (or guyots) | Seamounts having a comparatively smooth, flat top |
| TMTU | Tablemount (or guyot) | A seamount having a comparatively smooth, flat top |
| TNGU | Tongue | An elongate tongue-like extension of a flat sea floor into an adjacent higher feature |
| TRGU | Trough | A long depression of the sea floor characteristically flat bottomed and steep sided, and normally shallower than a trench |
| TRNU | Trench | A long, narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides |
| VALU | Valley | A relatively shallow, wide depression, the bottom of which usually has a continuous gradient |
| VLSU | Valleys | A relatively shallow, wide depression, the bottom of which usually has a continuous gradient |