EUNIS habitat type hierarchical view (marine version 2022 & terrestrial version 2021)

The EUNIS habitat classification review is on-going. Four groups are pending review: Inland waters, Wetlands, Constructed, industrial and other artificial habitats and Complexes.

• M : Marine benthic habitats (MA-MG)
  
• MH : Pelagic water column
  
  • MH1 : Neuston
    
  • MH2 : Completely mixed water column with reduced salinity
    
  • MH3 : Completely mixed water column with full salinity
    
    • MH31 : Arctic completely mixed water column with full salinity
      
    • MH32 : Atlantic completely mixed water column with full salinity
      
    • MH33 : Baltic completely mixed water column with full salinity
      
    • MH34 : Black Sea completely mixed water column with full salinity
      
      • MH341 : Black Sea completely mixed water column with full salinity and short residence time
        
      • MH342 : Black Sea completely mixed water column with full salinity and medium residence time
        
      • MH343 : Black Sea completely mixed water column with full salinity and long residence time
        
    • MH35 : Mediterranean completely mixed water column with full salinity
      
  • MH4 : Partially mixed water column with reduced salinity and medium or long residence time
    
  • MH5 : Unstratified water column with reduced salinity
    
  • MH6 : Vertically stratified water column with reduced salinity
    
    • MH61 : Arctic vertically stratified water column with reduced salinity
      
    • MH62 : Atlantic vertically stratified water column with reduced salinity
      
    • MH63 : Baltic vertically stratified water column with reduced salinity
      
    • MH64 : Black Sea vertically stratified water column with reduced salinity
      
    • MH65 : Mediterranean vertically stratified water column with reduced salinity
      
  • MH7 : Fronts in reduced salinity water column
    
  • MH8 : Unstratified water column with full salinity
    
  • MH9 : Vertically stratified water column with full salinity
    
  • MHA : Fronts in full salinity water column
    
• MJ : Ice-associated marine habitats
  
  • MJ1 : Sea ice
    
    • MJ11 : Arctic sea ice
      
    • MJ12 : Baltic sea ice
      
  • MJ2 : Freshwater ice
    
    • MJ21 : Arctic freshwater ice
      
  • MJ3 : Brine channels
    
    • MJ31 : Arctic brine channels
      
    • MJ32 : Baltic brine channels
      
  • MJ4 : Under-ice habitat
    
• N : Coastal habitats
  
  • N1 : Coastal dunes and sandy shores
    
    • N11 : Atlantic, Baltic and Arctic sand beach
      
    • N12 : Mediterranean and Black Sea sand beach
      
    • N13 : Atlantic and Baltic shifting coastal dune
      
    • N14 : Mediterranean, Macaronesian and Black Sea shifting coastal dune
      
    • N15 : Atlantic and Baltic coastal dune grassland (grey dune)
      
    • N16 : Mediterranean and Macaronesian coastal dune grassland (grey dune)
      
    • N17 : Black Sea coastal dune grassland (grey dune)
      
    • N18 : Atlantic and Baltic coastal Empetrum heath
      
    • N19 : Atlantic coastal Calluna and Ulex heath
      
    • N1A : Atlantic and Baltic coastal dune scrub
      
    • N1B : Mediterranean and Black Sea coastal dune scrub
      
    • N1C : Macaronesian coastal dune scrub
      
    • N1D : Atlantic and Baltic broad-leaved coastal dune forest
      
    • N1E : Black Sea broad-leaved coastal dune forest
      
    • N1F : Baltic coniferous coastal dune forest
      
    • N1G : Mediterranean coniferous coastal dune forest
      
    • N1H : Atlantic and Baltic moist and wet dune slack
      
    • N1J : Mediterranean and Black Sea moist and wet dune slack
      
  • N2 : Coastal shingle
    
  • N3 : Rock cliffs, ledges and shores, including the supralittoral
    
• Q : Wetlands
  
• R : Grasslands and lands dominated by forbs, mosses or lichens
  
• S : Heathland, scrub and tundra
  
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
  • U1 : Terrestrial underground caves, cave systems, passages and waterbodies
    
  • U2 : Screes
    
    • U21 : Boreal and arctic siliceous scree and block field
      
    • U22 : Temperate high-mountain siliceous scree
      
    • U23 : Temperate, lowland to montane siliceous scree
      
    • U24 : Mediterranean siliceous scree
      
    • U25 : Boreal and arctic base-rich scree and block field
      
    • U26 : Temperate high-mountain base-rich scree and moraine
      
    • U27 : Temperate, lowland to montane base-rich scree
      
      • U271 : Peri-Alpine thermophilous screes
        
      • U272 : Eastern Carpathian calcareous thermophilous screes
        
    • U28 : Western Mediterranean base-rich scree
      
      • U281 : Cevenno-Proven
        
      • U282 : Pyrenean calcareous screes
        
      • U283 : Oro-Cantabrian calcareous screes
        
      • U284 : Iberian calciphile fern screes
        
      • U285 : Southern Iberian calcareous screes
        
      • U286 : Central Mediterranean calcareous screes
        
    • U29 : Eastern Mediterranean base-rich scree
      
    • U2A : Crimean base-rich screes
      
  • U3 : Inland cliffs, rock pavements and outcrops
    
  • U4 : Snow or ice-dominated habitats
    
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
  • U6 : Recent volcanic features
    
• V : Vegetated man-made habitats