Almost the entire coastline of Anglesey is designated as an Area of Outstanding Natural Beauty (AONB) to protect the aesthetic appeal and variety of the island's coastal landscape and habitats from inappropriate development. The coastal zone of Anglesey was designated as an AONB in 1966 and was confirmed as such in 1967.
The AONB is predominantly a coastal designation, covering most of Angleseys 125 miles coastline but also encompasses Holyhead Mountain and Mynydd Bodafon. Substantial areas of other land protected by the AONB form the backdrop to the coast. The AONB is about 221 km2 and it is the largest AONB in Wales, covering one third of the island.