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
  
• MJ : Ice-associated marine habitats
  
  • MJ1 : Sea ice
    
  • MJ2 : Freshwater ice
    
  • MJ3 : Brine channels
    
  • MJ4 : Under-ice habitat
    
• N : Coastal habitats
  
  • N1 : Coastal dunes and sandy shores
    
  • N2 : Coastal shingle
    
    • N21 : Atlantic, Baltic and Arctic coastal shingle beach
      
    • N22 : Mediterranean and Black Sea coastal shingle beach
      
  • 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
    
    • U11 : Cave
      
    • U12 : Disused underground mines and tunnels
      
  • U2 : Screes
    
  • U3 : Inland cliffs, rock pavements and outcrops
    
    • U31 : Boreal and arctic siliceous inland cliff
      
    • U32 : Temperate high-mountain siliceous inland cliff
      
    • U33 : Temperate, lowland to montane siliceous inland cliff
      
    • U34 : Mediterranean siliceous inland cliff
      
      • U341 : Oro-Iberian siliceous cliffs
        
      • U342 : Southwestern Alpine siliceous cliffs
        
      • U343 : Cyrno-Sardinian montane and alpine cliffs
        
      • U344 : Peri-Pyrenean montane siliceous cliffs
        
      • U345 : Western Iberian siliceous cliffs
        
      • U346 : West Mediterranean thermophile siliceous cliffs
        
      • U347 : Bare Mediterranean siliceous inland cliff
        
      • U348 : Mediterranean disused siliceous quarries
        
    • U35 : Boreal and arctic base-rich inland cliff
      
    • U36 : Temperate high-mountain base-rich inland cliff
      
    • U37 : Temperate, lowland to montane base-rich inland cliff
      
    • U38 : Mediterranean base-rich inland cliff
      
    • U39 : Boreal ultramafic inland cliff
      
      • U391 : Boreal and arctic serpentine and basaltic cliff communities
        
      • U392 : Boreal bare inland basaltic and ultra-basic cliffs
        
        • U3921 : Boreal high altitude basaltic and ultra-basic cliffs
          
        • U3922 : Boreal mountain basaltic and ultra-basic cliffs
          
    • U3A : Temperate ultramafic inland cliff
      
    • U3B : Mediterranean ultramafic inland cliff
      
    • U3C : Macaronesian inland cliff
      
    • U3D : Wet inland cliff
      
    • U3E : Limestone pavement
      
  • U4 : Snow or ice-dominated habitats
    
    • U41 : Snow pack
      
    • U42 : Ice cap and glacier
      
    • U43 : Rock glacier and unvegetated ice-dominated moraine
      
      • U431 : Rock glaciers
        
      • U432 : Ice-core moraines
        
      • U433 : Unvegetated glacial moraines in the process of formation
        
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
  • U6 : Recent volcanic features
    
• V : Vegetated man-made habitats