| A100 - Littoral undetermined substrate with no sea ice presence |
| A101 - Littoral rock and biogenic with no sea ice presence |
| A103 - Littoral coarse sediment with no sea ice presence |
| A104 - Littoral mixed sediment with no sea ice presence |
| A105 - Littoral sand with no sea ice presence |
| A106 - Littoral mud with no sea ice presence |
| A110 - Littoral undetermined substrate with seasonal sea ice presence |
| A111 - Littoral rock and biogenic with seasonal sea ice presence |
| A113 - Littoral coarse sediment with seasonal sea ice presence |
|
| A114 - Littoral mixed sediment with seasonal sea ice presence |
| A115 - Littoral sand with seasonal sea ice presence |
| A116 - Littoral mud with seasonal sea ice presence |
| A120 - Littoral undetermined substrate with perrennial sea ice |
| A200 - Infralittoral undetermined substrate with no sea ice presence |
|
| A201 - Infralittoral rock and biogenic with no sea ice presence |
| A203 - Infralittoral coarse sediment with no sea ice presence |
| A204 - Infralittoral mixed sediment with no sea ice presence |
| A205 - Infralittoral sand with no sea ice presence |
| A206 - Infralittoral mud with no sea ice presenceA206 - Infralittoral mud with no sea ice presence |
| A210 - Infralittoral undetermined substrate with seasonal sea ice presence |
| A211 - Infralittoral rock and biogenic with seasonal sea ice presence |
| A213 - Infralittoral coarse sediment with seasonal sea ice presence |
| A214 - Infralittoral mixed sediment with seasonal sea ice presence |
| A215 - Infralittoral sand with seasonal sea ice presence |
| A216 - Infralittoral mud with seasonal sea ice presence |
|
| A220 - Infralittoral undetermined substrate with perrennial sea iceA220 - Infralittoral undetermined substrate with perrennial sea ice |
| A300 - Circalittoral undetermined substrate with no sea ice presence |
|
| A301 - Circalittoral rock and biogenic with no sea ice presence |
| A303 - Circalittoral coarse sediment with no sea ice presence |
| A304 - Circalittoral mixed sediment with no sea ice presence |
| A305 - Circalittoral sand with no sea ice presence |
| A306 - Circalittoral mud with no sea ice presence |
|
| A310 - Circalittoral undetermined substrate with seasonal sea ice presence |
| A311 - Circalittoral rock and biogenic with seasonal sea ice presence |
| A313 - Circalittoral coarse sediment with seasonal sea ice presence |
| A314 - Circalittoral mixed sediment with seasonal sea ice presence |
| A315 - Circalittoral sand with seasonal sea ice presence |
| A316 - Circalittoral mud with seasonal sea ice presence |
| A320 - Circalittoral undetermined substrate with perrennial sea ice |
| A326 - Circalittoral mud with perrennial sea ice |
| A400 - Offshore circalittoral undetermined substrate with no sea ice presence |
| A401 - Offshore circalittoral rock and biogenic with no sea ice presence |
| A403 - Offshore circalittoral coarse sediment with no sea ice presence |
| A404 - Offshore circalittoral mixed sediment with no sea ice presence |
| A405 - Offshore circalittoral sand with no sea ice presence |
| A406 - Offshore circalittoral mud with no sea ice presence |
| A410 - Offshore circalittoral undetermined substrate with seasonal sea ice presence |
| A411 - Offshore circalittoral rock and biogenic with seasonal sea ice presence |
| A413 - Offshore circalittoral coarse sediment with seasonal sea ice presence |
|
| A414 - Offshore circalittoral mixed sediment with seasonal sea ice presence |
| A415 - Offshore circalittoral sand with seasonal sea ice presence |
|
| A416 - Offshore circalittoral mud with seasonal sea ice presence |
| A420 - Offshore circalittoral undetermined substrate with perrennial sea ice |
| A426 - Offshore circalittoral mud with perrennial sea ice |
| A500 - Upper bathyal undetermined substrate with no sea ice presence |
|
| A501 - Upper bathyal rock and biogenic with no sea ice presence |
| A503 - Upper bathyal coarse sediment with no sea ice presence |
|
| A504 - Upper bathyal mixed sediment with no sea ice presence |
| A505 - Upper bathyal sand with no sea ice presence |
|
| A506 - Upper bathyal mud with no sea ice presence |
| A510 - Upper bathyal undetermined substrate with seasonal sea ice presence |
|
| A511 - Upper bathyal rock and biogenic with seasonal sea ice presence |
| A513 - Upper bathyal coarse sediment with seasonal sea ice presence |
| A514 - Upper bathyal mixed sediment with seasonal sea ice presence |
| A515 - Upper bathyal sand with seasonal sea ice presence |
| A516 - Upper bathyal mud with seasonal sea ice presence |
| A520 - Upper bathyal undetermined substrate with perrennial sea ice |
| A526 - Upper bathyal mud with perrennial sea ice |
| A600 - Lower bathyal undetermined substrate with no sea ice presence |
|
| A601 - Lower bathyal rock and biogenic with no sea ice presence |
| A603 - Lower bathyal coarse sediment with no sea ice presence |
| A604 - Lower bathyal mixed sediment with no sea ice presence |
| A605 - Lower bathyal sand with no sea ice presence |
| A606 - Lower bathyal mud with no sea ice presence |
| A610 - Lower bathyal undetermined substrate with seasonal sea ice presence |
| A614 - Lower bathyal mixed sediment with seasonal sea ice presence |
| A616 - Lower bathyal mud with seasonal sea ice presence |
| A620 - Lower bathyal undetermined substrate with perrennial sea ice |
| A700 - Abyssal undetermined substrate with no sea ice presence |
| A701 - Abyssal rock and biogenic with no sea ice presence |
| A704 - Abyssal mixed sediment with no sea ice presence |
| A705 - Abyssal sand with no sea ice presence |
|
| A706 - Abyssal mud with no sea ice presence |
| A710 - Abyssal undetermined substrate with seasonal sea ice presence |
| A720 - Abyssal undetermined substrate with perrennial sea ice |
| B1 - Coastal dunes and sandy shores |
| B2 - Coastal shingle |
| B3 - Rock cliffs, ledges and shores, including the supralittoral |
| C1 - Surface standing waters |
| C2 - Surface running waters |
| C3 - Littoral zone of inland surface waterbodies |
| D1 - Raised and blanket bogs |
| D2 - Valley mires, poor fens and transition mires |
| D3 - Aapa, palsa and polygon mires |
| D4 - Base-rich fens and calcareous spring mires |
| D5 - Sedge and reedbeds, normally without free-standing water |
| D6 - Inland saline and brackish marshes and reedbeds |
| E1 - Dry grasslands |
| E2 - Mesic grasslands |
| E3 - Seasonally wet and wet grasslands |
| E4 - Alpine and subalpine grasslands |
| E6 - Inland salt steppes |
| E7 - Sparsely wooded grasslands |
| F1 - Tundra |
| F2 - Arctic, alpine and subalpine scrub |
| F3 - Temperate and mediterranean-montane scrub |
| F4 - Temperate shrub heathland |
| F5 - Maquis, arborescent matorral and thermo-Mediterranean brushes |
|
| F6 - Garrigue |
|
| F7 - Spiny Mediterranean heaths (phrygana, hedgehog-heaths and related coastal cliff vegetation) |
| F8 - Thermo-Atlantic xerophytic scrub |
| F9 - Riverine and fen scrubs |
| FB - Shrub plantations |
| G1 - Broadleaved deciduous woodland |
| G2 - Broadleaved evergreen woodland |
| G3 - Coniferous woodland |
| G4 - Mixed deciduous and coniferous woodland |
| G5 - Lines of trees, small anthropogenic woodlands, recently felled woodland, early-stage woodland and coppice |
| H2 - Screes |
| H3 - Inland cliffs, rock pavements and outcrops |
| H4 - Snow or ice-dominated habitats |
| H5 - Miscellaneous inland habitats with very sparse or no vegetation |
| I1 - Arable land and market gardens |
| I2 - Cultivated areas of gardens and parks |
| J1 - Buildings of cities, towns and villages |
| J2 - Low density buildings |
| J3 - Extractive industrial sites |
| J4 - Transport networks and other constructed hard-surfaced areas |
| J5 - Highly artificial man-made waters and associated structures |
| J6 - Waste deposits |
| X1 - Estuaries |
| X2_3 - Coastal lagoons |
