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Special Areas of Conservation


Designated Special Area of Conservation (SAC)
Country Wales
Unitary Authority West Wales and The Valleys
Centroid* SH816440
Latitude 52.97722222
Longitude -3.782222222
SAC EU Code UK0030205
Status Designated Special Area of Conservation (SAC)
Area (ha) 19966.12
* This is the approximate central point of the SAC. In the case of large, linear or composite sites, this may not represent the location where a feature occurs within the SAC.
Location of Migneint-Arenig-Dduallt SAC

General site character

  • Inland water bodies (Standing water, Running water) (0.8%)
  • Bogs, Marshes, Water fringed vegetation, Fens (51.9%)
  • Heath, Scrub, Maquis and Garrigue, Phygrana (16.3%)
  • Dry grassland, Steppes (14.8%)
  • Humid grassland, Mesophile grassland (12.9%)
  • Improved grassland (0.1%)
  • Broad-leaved deciduous woodland (0.4%)
  • Coniferous woodland (2.2%)
  • Inland rocks, Screes, Sands, Permanent Snow and ice (0.4%)
  • Other land (including Towns, Villages, Roads, Waste places, Mines, Industrial sites) (0.2%)

Download the Standard Data Form for this site as submitted to Europe (PDF <100kb)

Note When undertaking an appropriate assessment of impacts at a site, all features of European importance (both primary and non-primary) need to be considered.

Annex I habitats that are a primary reason for selection of this site

  • Upland European dry heath at Migneint–Arenig–Dduallt is predominantly referable to NVC type H12 Calluna vulgarisVaccinium myrtillus heath. Locally at higher altitudes this shows the effects of wind-pruning, and is lichen-rich in places. Other forms of heath present include H18 Vaccinium myrtillusDeschampsia flexuosa heath, H21 Calluna vulgarisVaccinium myrtillusSphagnum capillifolium heath on damp north- to north-east facing cliffs, and H8 Calluna vulgarisUlex gallii heath at lower altitudes. The CallunaVacciniumSphagnum heath supports the Red Data Book liverwort Gymnocolea acutiloba.

  • 7130 Blanket bogs (* if active bog)  * Priority feature

    Migneint and Dduallt mark the limits of a large upland block located along the eastern fringe of Snowdonia National Park. The site supports the largest area of blanket bog in north Wales after Berwyn and is particularly significant for the extent and quality of comparatively Sphagnum-rich M19 Calluna vulgarisEriophorum vaginatum blanket mire. M18 Erica tetralixSphagnum papillosum blanket mire is also widespread, with localised representation of the bog-moss Sphagnum magellanicum and, rarely, S. imbricatum ssp. affine. Other notable species found at the site include lesser twayblade Listera cordata, tall bog-sedge Carex magellanica and few-flowered sedge C. pauciflora, here approaching the southern limit of its British distribution. The significant representation of more degraded vegetation types, including M20 Eriophorum vaginatum blanket mire, attests to a long history of anthropogenic modification including burning, grazing and moor-gripping – significant parts of the site were formerly managed as grouse moor. Large areas of dry and wet heath are also present, while soligenous mire communities feature as widespread and extensive components of the blanket mire.

Annex II species that are a primary reason for selection of this site

  • Not Applicable

Annex II species present as a qualifying feature, but not a primary reason for site selection

  • Not Applicable

Many designated sites are on private land: the listing of a site in these pages does not imply any right of public access.