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Contributors| featureClass | featureCode | longDescription | places | shortDescription |
|---|---|---|---|---|
U | PNLU | a high tower or spire-shaped pillar of rock or coral, alone or cresting a summit | View relation | pinnacle |
U | HLSU | elevations rising generally less than 500 meters | View relation | hills |
U | FANU | a relatively smooth feature normally sloping away from the lower termination of a canyon or canyon system | View relation | fan |
U | RDGU | a long narrow elevation with steep sides | View relation | ridge |
U | TMSU | seamounts having a comparatively smooth, flat top | View relation | tablemounts (or guyots) |
U | SHFU | 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 | View relation | shelf |
U | ARCU | a low bulge around the southeastern end of the island of Hawaii | View relation | arch |
U | PLTU | a comparatively flat-topped feature of considerable extent, dropping off abruptly on one or more sides | View relation | plateau |
U | KNLU | an elevation rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summit | View relation | knoll |
U | BSNU | a depression more or less equidimensional in plan and of variable extent | View relation | basin |
U | TERU | 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 | View relation | terrace |
U | LDGU | a rocky projection or outcrop, commonly linear and near shore | View relation | ledge |
U | CNSU | relatively narrow, deep depressions with steep sides, the bottom of which generally has a continuous slope | View relation | canyons |
U | HLLU | an elevation rising generally less than 500 meters | View relation | hill |
U | TMTU | a seamount having a comparatively smooth, flat top | View relation | tablemount (or guyot) |
U | TNGU | an elongate (tongue-like) extension of a flat sea floor into an adjacent higher feature | View relation | tongue |
U | SHVU | a valley on the shelf, generally the shoreward extension of a canyon | View relation | shelf valley |
U | LEVU | an embankment bordering a canyon, valley, or seachannel | View relation | levee |
U | PRVU | a region identifiable by a group of similar physiographic features whose characteristics are markedly in contrast with surrounding areas | View relation | province |
U | TRNU | a long, narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides | View relation | trench |