logo Walking Britain

Brecon Beacons Walk
Pen y Fan & Corn Du from Cwmgwdi

Nat Park - Brecon Beacons - Brecon Beacons Central

County/Area - Powys

Author - Lou Johnson

Length - 7.5 miles / 12.2 km    Ascent - 2200 feet / 667 metres

Time - 6 hours 0 minutes    Grade - moderate

Maps Ordnance Survey Logo Anquet Maps Logo

Ordnance Survey Explorer OL12Sheet Map1:25kBUY
Anquet OS Explorer OL12Digital Map1:25kBUY
Ordnance Survey Landranger 160Sheet Map1:50kBUY
Anquet OS Landranger 160Digital Map1:50kBUY

Walk Route Description

Photo from the walk - Pen y Fan & Corn Du from Cwmgwdi
Click image to visit gallery of 12 images.

The Brecon Beacons are superb mountains with Pen y Fan, the highest peak in the National Park of the same name, rising to 886 metres. Formed from red sandstone its northern face is dramatic with sheer cliffs dropping into deep cwms divided by ridges. Pen y Fan is often very busy with most walkers approaching the mountain from Storey Arms or other points along the A470. This more challenging route endeavours to avoid the crowds and approaches from the north using one of the pleasant ridges mentioned above.

The start is the car park (grid ref. SO024248), which can be found about half a mile south of Cwmgwdi along a narrow lane. The car park was once the site of an army camp. When parking remember that you will have to walk up the hill into the car park at the end of the day so parking nearer the bottom might be a better option as you can approach the climb fresh. Having parked walk uphill, go through the gate and follow the clear path south. The path climbs easily reaching the ridge linking Allt Ddu with Pen y Fan (grid ref. SO019233). On maps this ridge is named as Cefn Cwm Llwch and offers a superb way onto the Beacons. The path is clear, the views excellent and the grade not too steep apart from the final section up to Pen y Fan’s summit.

Arriving at the summit you are unlikely to enjoy the view by yourself. However it is impossible to deny the spectacular nature of the summit with a 360 degree panorama that covers much of the Brecon Beacons National Park, the hills of mid-Wales, the Usk Valley and South Wales. Continuing, walk west, descending slightly before regaining some of the lost height to reach the summit of Corn Du, which is very similar in character to its higher sister. Far below to the north lies Llyn Cwm Llwch and you should be able to make out the path descending to its north western shore. This path will form the key to our descent.

My preferred route off the summit of Corn Du is to head southwest on the main path leading to the A470. At grid ref SO005209 turn sharp right and head north across the western flank of Corn Du to reach the rim of Cwm Llwch (grid ref. SO002215). You can of course descend from Corn Du around the rim of Cwm Llwch but this always seems to be crowded with people struggling up the path. My route avoids this and is more pleasant under foot.

Continue along the clear path to reach the Obelisk to the lost lad. He was Tommy Jones and went missing on 4th August 1900 - the day the Queen Mother was born. The inscription tells the full story. Continue descending towards Llyn Cwm Llwch. If time and energy permit you can make the short diversion off the main path to the shores of the lake, but most continue ahead descending easily on the clear path. The path has been diverted around the cottage at Cwm-llwch (grid ref SO005237) from where you pick up a track. Follow this to reach a tarmac lane with the stream, on your right.

Follow the lane to reach a junction (grid ref. SO011252). Turn right and continue straight ahead ignoring the lane going off to the left. This lane is generally quiet but do be careful especially on bends where there are potential blind spots for traffic. Reaching a junction (grid ref. SO020252) bear right. This leads you to a further junction (grid ref. SO025251) where you turn right to regain the car park.

Other walks nearby

Walk 2400 Pen y Fan from Cwmgwdi near Breconmoderate5.0 miles
Walk 2074 Highest Peaks of the Brecon Beaconsmod/hard11.0 miles
Walk 3210 Pen-y-Crug hill fort from Breconeasy3.0 miles
Walk 3564 Groesfford and M & B Canal from Breconeasy/mod6.2 miles
Walk 3236 Pen-y-crug, Sarnau and Battle from Breconmoderate10.0 miles

Recommended Books & eBooks

Walking in Carmarthenshire

Walking in CarmarthenshireGuidebook to 30 walking routes (2 to 10 miles) in Carmarthenshire, south Wales, including sections of Carmarthenshire Coast Path. Walks for all abilities, including coastal, river, forest and hill walks in Cambrian Mountains, Tywi Valley, Y Mynydd Du (Black Mountains) and Brecon Beacons. Easy access from Bristol, Cardiff and Swansea.
More information

The Cambrian Way

The Cambrian WayGuidebook to the Cambrian Way, a challenging three-week mountain trek through Wales from Cardiff to Conwy. The 470km un-waymarked route is presented from south to north. Often sticking to long, beautiful ridgelines, it crosses wild and rugged terrain and visits many of Wales's highest mountains, including Snowdon.
More information

The End to End Trail

The End to End Trail
More information

Further Information

Walk Location Map

Walk location map

Brecon Beacons Walking

The Brecon Beacons National Park covers a wide area in South Wales. The high summits of the Beacons themselves tell only part the story as, like most National Parks, there is a varied range of scenery to be enjoyed within its boundaries. More Information

Walk grading - Learn how each walk is assessed and select a walk to suit your ability and experience by going to Walk Grading Details.

Accommodation Nearby

Danyfan - Brecon
0.9 miles / 1.4 km away
Tai'r Bull Country Inn
Libanus Brecon LD3 8EL
1.8 miles / 2.9 km away
Meadowview and Bluebell - Brecon Holidays
Brecon Beacons.
2.3 miles / 3.7 km away
Brynich Farm Cottages
3.5 miles / 5.5 km away
* Featured Supplier
The Dragons Back
9.8 miles / 15.8 km away
* Featured Supplier

Self Catering & Cottage Holidays - Properties throughout the UK & Europe

Follow Walking Britain for the latest news. Facebook Twitter

Mountain Weather

Stay safe on the mountains with detailed weather forecasts - for iOS devices or for Android devices.