Value Name |
Documentation |
gat
|
2
A natural or artificial passage or channel through shoals or steep banks, or across
a line of banks lying between two channels.
|
bank
|
3
An elevation over which the depth of water is relatively shallow, but normally sufficient
for safe surface navigation.
Typically located on a shelf (continental or insular).
|
deep
|
4
An obsolete term which was generally restricted to depths greater than 6,000 metres.
|
bay
|
5
An indentation in the coastline.
|
basin
|
7
A depression in the sea floor of variable extent.
|
tidalFlat
|
8
A large flat area of mud or sand attached to the shore and alternately covered and
uncovered by the tide.
|
trench
|
9
A long narrow, characteristically very deep and asymmetrical depression of the sea
floor, with relatively steep sides, commonly between abyssal hills and continental
margins.
Trenches are commonly associated with subduction zones, the trench then paralleling
a volcanic arc.
|
mudFlats
|
10
A level tract of land, as the bed of a dry lake or an area frequently uncovered at
low tide.
|
reef
|
11
A rock lying at or near the sea surface that may constitute a hazard to surface navigation.
|
ledge
|
12
A rocky formation continuous with and fringing the shore.
|
canyon
|
13
A relatively narrow, deep depression with steep sides, the bottom of which generally
has a continuous slope.
Developed characteristically on some continental slopes.
|
narrows
|
14
A navigable narrow part of a bay, strait, or river.
|
shoal
|
15
An offshore hazard to surface navigation that is composed of unconsolidated material.
|
knoll
|
16
A relatively small isolated elevation of a rounded shape.
|
ridge
|
17
A long, narrow elevation with steep sides often separating ocean basins.
|
seamount
|
18
A large isolated elevation, greater than 1000 metres in relief above the sea floor,
characteristically of conical form.
|
pinnacle
|
19
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. If completely submerged it may or may
not be a hazard to surface navigation.
|
abyssalPlain
|
20
An extensive, flat, gently sloping or nearly level region at abyssal depths.
|
plateau
|
21
A flat or nearly flat area of considerable extent, dropping off abruptly on one or
more sides.
|
spur
|
22
A subordinate elevation, ridge or rise projecting outward from a larger feature.
|
shelf
|
23
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
|
24
A long depression of the sea floor characteristically flat bottomed and steep sided
and normally shallower than a trench.
|
saddle
|
25
A broad pass, resembling in shape a riding saddle, in a ridge or between contiguous
seamounts.
|
abyssalHills
|
26
A tract, on occasion extensive, of often low (100-500 metre) elevations on the deep
sea floor.
|
apron
|
27
A gently dipping featureless surface, underlain primarily by sediment, at the base
of any steeper slope.
|
archipelagicApron
|
28
A gentle slope with a generally smooth surface on the sea floor, characteristically
found around groups of islands or seamounts.
|
borderland
|
29
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.
|
continentalMargin
|
30
The zone, generally consisting of shelf, slope and rise, separating the continent
from the abyssal plain or deep sea floor.
|
continentalRise
|
31
A gentle slope rising from the oceanic depths towards the foot of a continental slope.
|
escarpment
|
32
An elongated and comparatively steep slope separating or gently sloping areas.
|
fan
|
33
A relatively smooth, fan-like, depositional feature normally sloping away from the
outer termination of a canyon or canyon system.
|
fractureZone
|
34
An extensive linear zone of irregular topography of the sea floor, characterized by
steep-sided or asymmetrical ridges, troughs or escarpments.
|
gap
|
35
A narrow break in a ridge or a rise.
|
guyot
|
36
A seamount having a comparatively smooth flat top.
|
hill
|
37
A small isolated elevation of the sea floor.
|
hole
|
38
A local depression, often steep sided, of the sea floor.
|
levee
|
39
A depositional embankment bordering a canyon, valley or deep-sea channel.
|
medianValley
|
40
The axial depression of the mid-oceanic ridge system.
|
moat
|
41
An annular depression that may not be continuous, located at the base of many seamounts,
islands and other isolated elevations.
|
mountains
|
42
A large and complex grouping of ridges and seamounts.
|
peak
|
43
A prominent elevation either pointed or of a very limited extent across the summit.
|
province
|
44
A region identifiable by a group of similar physiographic features whose characteristics
are markedly in contrast with surrounding areas.
|
rise
|
45
A broad elevation that rises gently and generally smoothly from the sea floor.
May occasionally be used to refer to the linked major mid-oceanic mountain systems
of global extent.
|
seaChannel
|
46
A continuously sloping, elongated narrow depression commonly found in fans or abyssal
plains and customarily bordered by levees on one or both sides.
|
seamountChain
|
47
Several seamounts in linear or arcuate alignment.
|
shelfEdge
|
48
A narrow zone at the seaward margin of a shelf along which is a marked increase of
slope.
|
sill
|
49
A sea floor barrier of relatively shallow depth restricting water movement between
basins.
|
slope
|
50
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
|
51
A relatively flat horizontal or gently inclined surface, sometimes long and narrow,
that is bounded by a steeper ascending slope on one side and by a steeper descending
slope on the opposite side.
|
valley
|
52
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.
|
estuary
|
60
A funnel-shaped stream mouth or embayment where fresh water mixes with sea water under
tidal influences.
|
faultLine
|
63
A break or shear in the earth's crust with an observable displacement between the
two sides of the break, and parallel to the end of the break.
|
springs
|
70
The natural issue of fresh water from the bottom of the sea at one or more locations.
These fresh water emission(s) may affect buoyancy and/or anchorages within the area.
|
arch
|
75
A low bulge around the southeastern end of the island of Hawaii.
|
arrugado
|
76
An area of subdued corrugations off Baja California.
|
bight
|
77
An open body of water forming a slight recession in a coastline.
|
bench
|
78
A small terrace.
|
cordillera
|
79
An entire mountain system including the subordinate ranges, interior plateaus, and
basins.
|
cove
|
81
A small coastal indentation, smaller than a bay.
|
fjord
|
82
A long, narrow, steep-walled, deep-water arm of the sea at high latitudes, usually
along mountainous coasts.
|
flat
|
83
A small level or nearly level area.
|
fork
|
84
A branch of a canyon or valley.
|
furrow
|
85
A closed, linear, narrow, shallow depression.
|
gully
|
86
A small valley-like feature.
|
inlet
|
88
A narrow waterway extending into the land, or connecting a bay or lagoon with a larger
body of water.
|
mesa
|
89
An isolated, extensive, flat-topped elevation on a shelf, with relatively steep sides.
|
mound
|
90
A low, isolated, rounded hill.
|
platform
|
92
A flat or gently sloping underwater surface that may extend seaward from the shore,
and is often seaward of the shelfbreak.
|
plain
|
93
A flat, gently sloping or nearly level region.
|
ravine
|
94
A small canyon.
|
ramp
|
95
A gentle slope connecting areas of different elevations.
|
range
|
96
A series of associated ridges or seamounts.
|
sound
|
97
A long arm of the sea either forming a channel between the mainland and an island
or islands, or connecting two larger bodies of water.
|
shelfValley
|
99
A valley on a shelf, generally the shoreward extension of a canyon.
|
tongue
|
101
An elongate (tongue-like) extension of a flat sea floor into an adjacent higher feature.
|
basinRangeProvince
|
106
A regional geologic structure dominated by generally subparallel fault-block mountains
separated by broad alluvium-filled basins.
|
deeperLandwardTrenchWall
|
107
As a feature of a trench, the deeper landward trench wall is found closer to the bottom
of the trench running along the landward trench slope.
|
deepSeaTrench
|
108
Trenches that are emphasized coupled with subduction processes along the regional
contacts between continents and basins.
|
deformationZone
|
109
An area where there exists a change in the geometry of a body of rock due to folding,
faulting, shearing, or compression.
|
insularPlatform
|
110
An elevated and generally planar region along a shelf surrounding an island.
|
landwardSlopeApron
|
111
A delta-shaped sedimentary unit lying on a trench floor on the regional slope adjacent
to a continental margin.
|
landwardSlopeCanyon
|
112
A deep valley-like incision into the continental slope, thought to be eroded by turbidity
currents.
|
landwardUpperSlope
|
113
A shallower descent along a regional slope adjacent to a continental margin, usually
associated with a subduction zone.
|
marginalEscarpment
|
114
A relatively elongated and comparatively steep slope separating more gently sloping
areas.
|
marginalPlateau
|
115
A relatively flat shelf adjacent to a continent and similar topographically to, but
deeper than, a continental shelf.
|
marginalTrench
|
116
A narrow, steep-sided trough roughly parallel to a continental margin at the seaward
base of a continental platform, and associated with plate subduction.
|
midOceanRidge
|
117
A ridge that extend through all of the oceans, with a total length of 80,000 kilometres
and an average depth of about 2500 metres.
It occurs in the middle part of the oceans (except in the North Pacific where it is
confined to the far eastern region). The mid-ocean ridge essentially represents a
broad undersea cordillera or mountain range that rises to its highest elevation at
the axis and slopes away on either flank.
|
midSlopeTerrace
|
118
A planar region within a regional slope along a continental margin or the flanks of
a subduction zone.
|
oceanTrench
|
119
An emphasized trench that is coupled with subduction processes, particularly within
the oceans.
|
oceanBasinHills
|
120
Abyssal hills that are emphasized by the hilly- and/or seamount-covered deep ocean
provinces that are covered only by pelagic deposits and locally derived material eroded
from adjacent hills and/or seamounts.
|
platformUpperSlope
|
121
An upper/shallower descending margin from a platform.
|
ridgesValleys
|
122
A surface characterized by a close succession of parallel or nearly parallel ridges
and valleys, and resulting from the differential erosion of highly folded strata of
varying resistances.
|
ridgeValleyComplex
|
123
A complex physiography of generally adjacent and linear ridges and valleys.
The genesis of this morphology is initial expression due to rising magna and the creation
of a seafloor spreading zone.
|
riftValley
|
124
A valley that has developed along a rift.
It is 1 to 2 kilometres deep, a few tens of kilometres wide, and lies along the axis
of the ridge.
|
slopeBasin
|
125
A sedimentary basin located along the slope portion of a continental margin.
|
slump
|
126
A type of sediment slide where the downward slipping mass of rock or unconsolidated
material of any size moves as a single unit or as several related units.
|
trenchFloor
|
127
A floor of a trench as contrasted with the adjacent walls of the trench.
|
upperTrenchSlope
|
128
The slope of the overriding plate where two plates collide, one plate bends downward
and a trench is formed.
|
noInformation
|
-999999
No Information
|
notApplicable
|
998
Not Applicable
|
other
|
999
Other
|