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
  
• N : Coastal habitats
  
  • N1 : Coastal dunes and sandy shores
    
  • 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
    
    • 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
      
      • U321 : Middle European siliceous cliffs of the sub-alpine, alpine and nival zones of temperate high-mountains
        
      • U322 : Bare temperate high-mountain siliceous inland cliff
        
        • U3221 : Temperate high altitude siliceous cliffs
          
        • U3222 : Temperate high mountain siliceous cliffs
          
      • U323 : Temperate high-mountain disused siliceous quarries
        
    • U33 : Temperate, lowland to montane siliceous inland cliff
      
      • U331 : Middle European lowland to montane siliceous cliffs
        
      • U332 : Helleno-Carpatho-Balkanic Silene siliceous cliffs
        
      • U333 : Lowland northern- and middle-European siliceous cliffs
        
      • U334 : Bare temperate lowland to montane siliceous inland cliff
        
      • U335 : Temperate lowland to montane disused siliceous quarries
        
    • U34 : Mediterranean siliceous inland cliff
      
    • 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
      
      • U381 : Tyrrheno-Adriatic eumediterranean calcicolous chasmophyte communities
        
      • U382 : Western mediterraneo-montane chasmophyte communities
        
      • U383 : Hellenic eumediterranean calcicolous chasmophyte communities
        
      • U384 : Aegeo-east-Mediterranean base-rich inland chasmophyte communities
        
      • U385 : Southern Hellenic Potentilla cliffs
        
      • U386 : Central Hellenic Potentilla cliffs
        
      • U387 : Mediterranean bare limestone inland cliffs
        
      • U388 : Mediterraneo-Anatolian calcicolous chasmophyte communities
        
      • U389 : Mediterranean disused chalk and limestone quarries
        
    • U39 : Boreal ultramafic inland cliff
      
    • 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
    
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
  • U6 : Recent volcanic features
    
    • U61 : Subarctic volcanic field
      
      • U611 : Icelandic solfataras
        
      • U612 : Subarctic barren lava fields and flows
        
      • U613 : Subarctic volcanic ash and lapilli fields
        
    • U62 : Mediterranean, Macaronesian and temperate volcanic field
      
• V : Vegetated man-made habitats
  
  • V1 : Arable land and market gardens
    
  • V2 : Cultivated areas of gardens and parks
    
  • V3 : Artificial grasslands and herb dominated habitats
    
  • V4 : Hedgerows
    
  • V5 : Shrub plantations
    
  • V6 : Tree dominated man-made habitats