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| Corn Du | |
|---|---|
| Name | Corn Du |
| Elevation m | 873 |
| Prominence m | 12 |
| Range | Brecon Beacons |
| Location | Powys, Wales |
| Grid ref | SO012215 |
| Topo | Ordnance Survey |
Corn Du Corn Du is a prominent summit on a high escarpment in Powys, within the Brecon Beacons of Wales. It forms part of a twin summit with a higher neighbour and overlooks the Usk Reservoir, River Usk, and surrounding upland peatlands. Corn Du is noted for its visibility from Cardiff, its cairn remains, and its role in regional hillwalking and conservation.
Corn Du stands on the central ridge of the Brecon Beacons near the watershed between the River Usk and tributaries draining to the Severn Estuary. The summit lies close to a higher neighbour along a broad plateau bounded to the south by steep escarpments that drop toward Merthyr Tydfil, Abergavenny, and the Vale of Neath. From the summit area there are panoramic views toward Cardiff, the Black Mountains, Pen y Fan, and the Cambrian Mountains. The plateau supports an extensive network of footpaths linking to features such as the Beacons Way, Offa's Dyke Path, and other long-distance routes across Wales.
Corn Du is composed primarily of Old Red Sandstone formations deposited during the Devonian period and shaped by successive glaciations during the Quaternary. The escarpments expose resistant sandstone beds overlying softer mudstones, producing the steep cliffs and tors characteristic of the central Brecon Beacons rim. Periglacial processes and peat accumulation have modified the summit plateau, while post-glacial fluvial incision by tributaries of the River Usk contributed to the present drainage pattern. Geological mapping by agencies such as the British Geological Survey has documented the stratigraphic sequences and structural faults affecting the area.
The summit area contains prehistoric cairns and burial mounds associated with Bronze Age activity, part of a wider archaeological landscape that includes standing stones and field systems found across South Wales. During the medieval period the surrounding uplands were used for transhumant grazing tied to manorial and parish institutions in Monmouthshire and Breconshire, and later enclosed landscapes reflect changes after the Industrial Revolution as nearby towns like Merthyr Tydfil expanded. Corn Du has become a cultural landmark in Welsh recreational literature and guidebooks, appearing in works produced by the Ramblers' Association and regional historians documenting upland commons. Modern conservation designations by bodies such as Natural Resources Wales and Brecon Beacons National Park Authority recognize its archaeological and ecological value.
Access to the summit is facilitated by well-maintained footpaths and bridleways connecting to trailheads at Storey Arms, Pont ar Daf, and car parks on the A470 corridor. The route network serves walkers, fell-runners, and mountain bikers using waymarked links to peaks like Pen y Fan, and forms part of circular routes promoted by local tourism organisations including Visit Wales. Navigation across the peat-covered plateau requires care in poor visibility; mountain rescue incidents have involved teams from Brecon Mountain Rescue Team responding to emergencies. Seasonal events and guided walks are often organised by outdoor groups such as the Youth Hostels Association and local mountaineering clubs.
The upland habitats on and around the summit support heathland and acid grassland communities with species recorded by surveys from agencies like Natural Resources Wales and the National Trust. Vegetation includes heather, bilberry, and blanket bog species adapted to the acidic peaty soils typical of Cambrian-influenced uplands. Birdlife includes upland specialists such as red grouse, meadow pipit, and occasional merlin recorded by ornithological societies, while mammals like European otter occur downstream in the River Usk catchment and red fox frequent lower slopes. Conservation management addresses invasive bracken and the restoration of peatland to improve carbon storage and biodiversity, guided by policies from bodies including the UK Environment Agency and regional conservation partnerships.
Category:Mountains and hills of Powys Category:Brecon Beacons