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)
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MH : Pelagic water column
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MJ : Ice-associated marine habitats
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N : Coastal habitats
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R : Grasslands and lands dominated by forbs, mosses or lichens
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S : Heathland, scrub and tundra
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T : Forest and other wooded land
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U : Inland habitats with no or little soil and mostly with sparse vegetation
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U1 : Terrestrial underground caves, cave systems, passages and waterbodies
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U2 : Screes
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U3 : Inland cliffs, rock pavements and outcrops
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U31 : Boreal and arctic siliceous inland cliff
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U32 : Temperate high-mountain siliceous inland cliff
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U321 : Middle European siliceous cliffs of the sub-alpine, alpine and nival zones of temperate high-mountains
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U322 : Bare temperate high-mountain siliceous inland cliff
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U323 : Temperate high-mountain disused siliceous quarries
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![Southwestern Alpine siliceous cliffs](images/img_bullet.gif)
![Cyrno-Sardinian montane and alpine cliffs](images/img_bullet.gif)
![Peri-Pyrenean montane siliceous cliffs](images/img_bullet.gif)
![Western Iberian siliceous cliffs](images/img_bullet.gif)
![West Mediterranean thermophile siliceous cliffs](images/img_bullet.gif)
![Bare Mediterranean siliceous inland cliff](images/img_bullet.gif)
![Mediterranean disused siliceous quarries](images/img_bullet.gif)
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![Lowland middle European calcareous cliff communities](images/img_bullet.gif)
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![Temperate, lowland to montane disused chalk and limestone quarries](images/img_bullet.gif)
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![Macaronesian inland cliff](images/img_bullet.gif)
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![Limestone pavement](images/img_bullet.gif)
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![Fjell field[](images/img_bullet.gif)
![Polar desert](images/img_bullet.gif)
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