Halkyn Common and Holywell Grasslands (Welsh: Comin Helygain a Glaswelltiroedd Treffynnon) is a Site of Special Scientific Interest in Flintshire, north Wales covering Halkyn Mountain and surrounding areas. It lies 4 km north-west of Mold on a plateau about 100–300 m above sea-level.[1] It includes 699.3 hectares of grassland, heathland and other open vegetation with numerous spoil tips and quarries.[1] The site is notable for populations of plants such as spring sandwort and stemless thistle and amphibians such as the great crested newt.[1]
53°14′N 3°13′W / 53.23°N 3.21°W