Most of the land area of Wales is covered by grassland, much of this, if not all, has been modified through agricultural processes, atmospheric depositions or both. We have used an initial dichotomy of dry grassland and marshy grassland, with more detailed descriptions of the main grassland types provided under the relevant section. Note that dune grasslands have been covered in the section on ‘Coastal dunes’ and that agricultural grasslands are in the section covering ‘Agricultural habitats’.