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Public-images-osm logo.svg seamark:sea_area:category
Categories of sea area Edit this description in the wiki page. Edit this description in the data item.
Group: marine
Used on these elements
may be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Documented values: 2
Status: de facto

Categories sea areas (CATSEA)


Classification of an area based on its physical characteristics.

Category seamark:sea_area:category Definition
Gat gat A natural or artificial passage or channel through shoals or steep banks, or across a line of banks lying between two channels.
Bank bank An elevation over which the depth of water is relatively shallow, but normally sufficient for safe surface navigation.
Deep deep In oceanography, an obsolete term which was generally restricted to depths greater than 6,000 m
Bay bay An indentation in the coastline. See also natural=bay.
Trench trench A long narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides.
Basin basin A depression, characteristically in the deep sea floor, more or less equidimensional in plan and of variable extent.
Flat flat A level tract of land, as the bed of a dry lake or an area frequently uncovered at low tide. Usually in plural.
Reef reef Rock lying at or near the sea surface that may constitute a hazard to surface navigation. See also natural=reef
Ledge ledge A rocky formation continuous with and fringing the shore.
Canyon canyon A relatively narrow, deep depression with steep sides, the bottom of which generally has a continuous slope, developed characteristically on some continental slopes.
Narrowa narrows A navigable narrow part of a bay, strait, river, etc.
Shoal shoal An offshore hazard to surface navigation that is composed of unconsolidated material.
Knoll knoll A relatively small isolated elevation of a rounded shape.
Ridge ridge (a) A long, narrow elevation with steep sides. (b) A long, narrow elevation often separating ocean basins. (c) The linked major mid-oceanic mountain systems of global extent.
Seamount seamount A large isolated elevation, greater than 1000m in relief above the sea floor, characteristically of conical form.
Pinnacle pinnacle Any high tower or spire-shaped pillar or rock or coral, alone or cresting a summit. It may extend above the surface of the water. It may or may not be a hazard to surface navigation.
Abyssal plain abyssal_plain An extensive, flat, gently sloping or nearly level region at abyssal depths.
Plateau plateau A flat or nearly flat area of considerable extent, dropping off abruptly on one or more sides.
Spur spur A subordinate elevation, ridge or rise projecting outward from a larger feature.
Shelf shelf A zone adjacent to a continent (or around an island) and extending from the low water line to a depth at which there is usually a marked increase of slope towards oceanic depths.
Trough trough A long depression of the sea floor characteristically flat bottomed and steep sided and normally shallower than a trench.
Saddle saddle A broad pass, resembling in shape a riding saddle, in a ridge or between contiguous seamounts.
Abyssal hills abyssal_hills A tract, on occasion extensive, of low (100-500m) elevations on the deep sea floor.
Apron apron A gently dipping featureless surface, underlain primarily by sediment, at the base of any steeper slope.
Archipelagic apron archipelagic_apron A gentle slope with a generally smooth surface on the sea floor, characteristically found around groups of islands or seamounts.
Borderland 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.
Continental margin continental_margin The zone, generally consisting of shelf, slope and rise, separating the continent from the abyssal plain or deep sea floor.
Continental rise continental_rise A gentle slope rising from the oceanic depths towards the foot of a continental slope.
Escarpment escarpment An elongated and comparatively steep slope separating or gently sloping areas.
Fan fan A relatively smooth, fan-like, depositional feature normally sloping away from the outer termination of a canyon or canyon system.
Fracture zone fracture_zone An extensive linear zone of irregular topography of the sea floor, characterized by steep-sided or asymmetrical ridges, troughs or escarpments.
Gap gap A narrow break in a ridge or a rise.
Guyot guyot A seamount having a comparatively smooth flat top.
Hill hill A small isolated elevation (see also abyssal hills).
Hole hole A local depression, often steep sided, of the sea floor.
Levee levee A depositional embankment bordering a canyon, valley or deep-sea channel.
Median valley median_valley The axial depression of the mid-oceanic ridge system.
Moat moat An annular depression that may not be continuous, located at the base of many seamounts, islands and other isolated elevations.
Mountains mountains A large and complex grouping of ridges and seamounts.
Peak peak A prominent elevation either pointed or of a very limited extent across the summit.
Province province A region identifiable by a group of similar physiographic features whose characteristics are markedly in contrast with surrounding areas.
Rise rise (a) A broad elevation that rises gently and generally smoothly from the sea floor. (b) The linked major mid-oceanic mountain systems of global extent.
Sea channel sea_channel A continuously sloping, elongated narrow depression commonly found in fans or abyssal plains and customarily bordered by levees on one or both sides.
Seamount chain seamount_chain Several seamounts in linear or orcuate alignment.
Shelf-edge shelf-edge A narrow zone at the seaward margin of a shelf along which is a marked increase of slope.
Sill sill A sea floor barrier of relatively shallow depth restricting water movement between basins.
Slope slope The slope seaward from the shelf edge to the upper edge of a continental rise or the point where there is a general reduction in slope.
Terrace 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 steeper descending slope on the opposite side.
Valley valley A relatively shallow, wide depression, the bottom of which usually has a continuous gradient. This term is generally not used for features that have canyon-like characteristics for a significant portion of their extent.
Canal canal An artificial water course used for navigation.
Lake lake A large body of water entirely surrounded by land.
River river A relatively large natural stream of water.
Reach reach A straight section of a river, especially a navigable river between two bends or an arm of the sea extending into the land.

See also