Cambrian Mountains

Cefn Croes wind farm

While Snowdonia contains a mix of volcanic rocks and sedimentary rocks of Cambrian and Ordovician age, the mountains of South Wales are mainly Devonian age Old Red Sandstone and Carboniferous Limestone and similarly aged sandstones. The ranges of mid-Wales on the other hand are predominantly formed from Ordovician and Silurian sandstones and mudstones which in many areas outcrop only infrequently so resulting in more rounded grassy hills. The Cambrian Mountains (in the modern sense of the term) are generally less popular with hillwalkers and scramblers than the ranges to their north and south. Since all of Wales' ranges face the predominant westerly air stream coming in from the Atlantic Ocean, they enjoy high levels of rainfall and are the source of numerous rivers, among which the rivers Severn and Wye, which rise on the eastern slopes of Pumlumon, are the largest.

The Cambrian Mountains host the Elan Valley Reservoirs and Llyn Brianne reservoir, which provide water for the English West Midlands and for South Wales respectively. They include the Clywedog Reservoir and Nant y Moch Reservoir. Cefn Croes, the site of a controversial wind farm project, is in the Cambrian Mountains, just south of the A44 road between Aberystwyth and Llangurig.[1][2][3]

The area was proposed as a national park in 1965 by the National Parks Commission, a precursor body of the Countryside Commission. However, the proposal was opposed by many farmers and local authorities in the area. Formal consultations on the proposal began in 1970, and in 1971 the Countryside Commission proposed a revised boundary for the designation. The proposed area, of 467 square miles (1,210 km²), covered the area of Pumlumon and Elenydd, within an area bounded by the settlements of Machynlleth, Llangurig, Rhayader, Newbridge-on-Wye, Llanwrtyd Wells, Llandovery, Pumsaint, Tregaron, and Devil's Bridge. Despite continuing local opposition, the Countryside Commission published the order designating the area on 15 August 1972, and submitted it to the Secretary of State for Wales, Peter Thomas, for confirmation.[4][5]

Objections to the proposed designation were then made by all five county councils, 5 of the 7 district councils, 5 parish councils, the National Farmers Union, the Country Landowners Association, Plaid Cymru, the Campaign for the Protection of Rural Wales and others. Support for the designation was expressed by the Ramblers Association, Youth Hostels Association, and Cyclists' Touring Club. In July 1973, the Secretary of State announced the decision not to proceed with the designation because of "massive evidence of objections", and also rejected a call to hold a public inquiry. This was the first time such a recommendation on national park designation had not been accepted.[5]

This list confines itself to the more geographically restricted area referred to above.

• Pen Pumlumon Fawr [Plynlimon] 2,467 ft (752 m)
• Pen Pumlumon Arwystli 2,431 ft (741 m)
• Pen Pumlumon Llygad-bychan 2,385 ft (727 m)
• Y Garn 2,244 ft (684 m)
• Pumlumon Fach 2,179 ft (664 m)
• Great Rhos 2,165 ft (660 m)
• Black Mixen 2,130 ft (650 m)
• Drygarn Fawr 2,116 ft (645 m)
• Gorllwyn 2,011 ft (613 m)
• Bache Hill 2,000 ft (610 m)
• Pen y Garn 2,004 ft (611 m)
• Y Gamriw 1,982 ft (604 m)
• Llan Ddu Fawr 1,948 ft (594 m)
• Pegwn Mawr 1,923 ft (586 m)
• Clipyn Du 1,909 ft (582 m)
• Y Glog (Draws Drum) 1,883 ft (574 m)
• Cefn Croes 1,879 ft (573 m)

• 
  The Nant Rhuddnant gorge looking north to Cefn Coch from the summit of Pen y Garn. In the background are Y Garn(left), Pen Pumlumon Fawr and Pen Pumlumon Arwystli (right)
• 
  The Desert of Wales seen from Drygarn Fawr
• 
  Panorama of some of the Snowdon Massif including Snowdon (centre right) taken from Mynydd Mawr. The Glyderau are visible in the distance
• 
  The Llyn Brianne spillway spilling immediately after its first fill at commissioning

• Elenydd
• Desert of Wales
• The Cambrian Way high level long-distance footpath
• Exercise Cambrian Patrol

• The Cambrian Mountains Society
• The Cambrian Mountains Initiative
• Cambrian Mountains tourism guide
• Cambrian Mountains walking guide