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Contributors| featureClass | featureCode | longDescription | places | shortDescription |
|---|---|---|---|---|
undersea | APNU | a gentle slope, with a generally smooth surface, particularly found around groups of islands and seamounts | View relation | apron |
undersea | ARCU | a low bulge around the southeastern end of the island of Hawaii | View relation | arch |
undersea | ARRU | an area of subdued corrugations off Baja California | View relation | arrugado |
undersea | BDLU | 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 | View relation | borderland |
undersea | BKSU | elevations, typically located on a shelf, over which the depth of water is relatively shallow but sufficient for safe surface navigation | View relation | banks |
undersea | BNKU | an elevation, typically located on a shelf, over which the depth of water is relatively shallow but sufficient for safe surface navigation | View relation | bank |
undersea | BSNU | a depression more or less equidimensional in plan and of variable extent | View relation | basin |
undersea | CDAU | an entire mountain system including the subordinate ranges, interior plateaus, and basins | View relation | cordillera |
undersea | CNSU | relatively narrow, deep depressions with steep sides, the bottom of which generally has a continuous slope | View relation | canyons |
undersea | CNYU | a relatively narrow, deep depression with steep sides, the bottom of which generally has a continuous slope | View relation | canyon |
undersea | CRSU | a gentle slope rising from oceanic depths towards the foot of a continental slope | View relation | continental rise |
undersea | DEPU | a localized deep area within the confines of a larger feature, such as a trough, basin or trench | View relation | deep |
undersea | EDGU | a line along which there is a marked increase of slope at the outer margin of a continental shelf or island shelf | View relation | shelf edge |
undersea | ESCU | an elongated and comparatively steep slope separating flat or gently sloping areas | View relation | escarpment (or scarp) |
undersea | FANU | a relatively smooth feature normally sloping away from the lower termination of a canyon or canyon system | View relation | fan |
undersea | FLTU | a small level or nearly level area | View relation | flat |
undersea | FRZU | an extensive linear zone of irregular topography of the sea floor, characterized by steep-sided or asymmetrical ridges, troughs, or escarpments | View relation | fracture zone |
undersea | FURU | a closed, linear, narrow, shallow depression | View relation | furrow |
undersea | GAPU | a narrow break in a ridge or rise | View relation | gap |
undersea | GLYU | a small valley-like feature | View relation | gully |