IUCN strict nature reserve An IUCN protected area in which human visitation, use and impacts are strictly controlled and limited to ensure protection and conservation of natural biodiversity and/or geodiversity, natural ecosystem assemblages and processes, and any associated cultural and spiritual values. IUCN-PACS:Ia strict nature reserve Note that this ENVO class is not authoritative: see the associated IUCN references for a complete definition of all Protected Areas. Previous anthropogenic impacts (e.g. by early human settlement) may be present in these sites; these should be reversible by either natural processes or brief restorative interventions. Note that this ENVO class is not authoritative: see the associated IUCN references for a complete definition of all Protected Areas. area protected according to IUCN guidelines