Dorset’s nature areas of national importance layer combines all the sites that are currently recognised and protected within the land-use planning system for their biodiversity value.
It includes:
- national conservation sites
- Site of Special Scientific Interest (SSSI)
- Ramsar (wetland of international importance)
- National Nature Reserve (NNR)
- Special Area of Conservation (SAC)
- Special Protection Area (SPA)
- Local Nature Reserves (LNR)
- irreplaceable habitat
Defra calls this layer Areas of Particular Importance for Biodiversity (APIB).