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Name:Pen Twyn Mawr
Hill number:2251
Height:658m / 2159ft
Parent (Ma):2229  Waun Fach
RHB Section:32A: Llandovery to Monmouth
Nuttall/Wainwright area:Black Mountains
County/UA:Powys
Catchment:Usk
Class:Nuttall, Bridge
(N,Bg)
Grid ref:SO 24228 26728
Summit feature:no feature 15m NE of cairn
Drop:18m
Col:640m  SO242270  
OS map sheet(s):(1:50k) 161
(1:25k) OL13N
Survey:Abney level
Change log:show changes for this hill entry
GPS data:show GPS entries for this hill

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N.B. Some hill summits are on private property or on land where there is no public right of way.  Permission should be sought from the landowner where access to a hill summit is through private land.
Please report via the contact page any logs you see below which describe or encourage acts of trespass.  Please quote the hill number and hill name.

Logged Descriptions  (logged by 497 users, only the latest 50 shown - Show all)ByDate of Ascent
11 km hike from the Mynydd Du Forest car park. Very drizzly but evening sun and mist once at the summit. Had to negotiate forest operations on the ascentjoriswmdb08/08/2023
Pen Allt-mawr - Pen Twyn Glas - Mynedd Llysiau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr - Pen Cerrig-calch from Cwmdu. 19 milesGary Heath25/07/2023
Solo, Black Mountains Loop from Mynydd Du car park.paulh7904/03/2023
Nice little loop up the valley past the hermitage then up over Waun Fach, Pen y Gadair Fawr and Pen Twyn Mawr. Decent paths all day in changable, sometimes challenging, weather.sebastiencale08/11/2022
Cwm Banw Bridge > Tal Twynau > Pen Twyn Glas > Mynydd Llysiau > Pen Trumau > Waun Fach > Pen y Gadair Fawr > Pen Twyn Mawr > Pentwyn > Cwm Banw Bridge.Winterfloodian01/08/2022
Parked at Mynydd Du then up to Chwarel Y Fan, back down and then up to Pen Y Gadair Fawr and ridge walked to Pen Twyn Mawr before heading back down and getting lost in the forest.SootAndShale06/05/2022
Waun Fach horseshoeBarns15018/04/2022
Parked on the minor road to the East of Pen Cerrig-calch GR23456 22893 where there is a small parking area then walked back up the road to meet the Beacons way for a Seventeen mile Nuttall walk. Visiting the summits of Pen Cerrig-calch, Pen Allt- mawr,Pen Twyn Glas,Mynydd Llysiau, Waun Fach, Pen y Gadair Fawr and PenTwyn Mawr taking just under Seven hours.WAYNE ROWLETT06/03/2022
Heather by path at HP. Down ridge path after Pen Y Gadair Fawr. Mapped trees mainly felled. Onto Crug Mawr.Low cloud and windy. With group.Denise 08/02/2022
Circular of Pen Cerrig-calch, Pen Allt-mawr,Pen Twyn Glas,Mynydd Llysiau, Waun Fach, Pen y Gadair Fawr and Pen Twyn Mawr.Arbie08/02/2022
Last summit of a perfect hill day. This area exemplifies the things I like about Wales.I even stopped on the summit of Waun Fach to sit with the winter sun on my back, eat my sandwiches and chat to other walkers about distant hills and stuff. Actually, the descent was imperfect. Tried to find the path that starts SE of spot 579. Might have been on it but couldn't find a way into the forest. Followed the treeline SE to a gate and a route that seemed promising but led nowhere. Traipsed around various saturated dead end tracks and eventually crashed out of the woods north of Cwm-Pitt and found my way to Tir Y Nant. Would not recommend.Wycombe Wanderer12/01/2022
Nuttals routeIanHHill03/10/2021
Black Mountains horseshoe run.Dave Ing11/09/2021
ellieMunroist393503/09/2021
20 mile Waun Fach round, parked at Pont Cadwgan with no issue, started at Crug Mawr and walked anticlockwise along the the obvious route. A tough route but rewarding, and definitely better this way around I think!JazDisney12/06/2021
Circuit inc Table Mountain, Mynydd Llysiau, Waun FachAjm031025/04/2021
Llanbedr Horseshoe Route.sionbrit11/04/2021
Grwyne Fechan horseshoe from layby at SO234228AndrewP03/04/2021
Dropped by taxi at junction near Cwm Farm. A round of the western Black Mountains then down to campsite at Crickhowell. Started misty then cleared to beautiful sunshine. With B and R.jenx09/09/2020
Poor conditions, very wet, bad visibility.Started off in Black Mountain (Mynydd Du) Car Park And Picnic Area and followed the path up towards Grwyne Fawr Reservois. Continued up the path before doubling back and heading to Waun Fach, following down to Pen y Gadair Fawr and Pen Twyn Mawr. Cut through Mynydd Du forestry land to get back to the car parklboutside22/08/2020
From Pont Cadwgan CP - Bal Mawr - Chwarel y Fan - Pen y Gadair Fawr - Pen Twyn Mawr - Pont Cadwgan CPscreeleep01/08/2020
Eugh. Tough way to end a day! Boggy. Heather-y. The paths that appear to be straight up/down through the forest either aren't there or are horrendously overgrown. But the sunset over Pen y Fan was worth it. With GFE. 35km total. Covid-19 escaping. Chwarel y Fan, Black Mountain South Top, Black Mountain, Hay Bluff, Lord Heresford's Knob, Rhos Dirion, Waun Fach, Pen y Gadair Fawr, Pen Twyn Mawr.Fionalevey21/03/2020
Long circular walk from Llanbedr, good views all round, Bog underfoot on the last summit. (After staying near the forest of dean, in October Half term)Joel45128/10/2019
23 miles, 3412ft, Crickhowell to Waun Fach walk.stephenbuda25/08/2019
Ascent from Neuadd Fawr to Pen Twyn Mawr (658m), then north along ridge to Pen y Gadair Fawr (800m), and Waun Fach (811m), before turning west and south to Mynydd Llysaiu (663m) and finally to Pen Twyn Glas (646m) before descending to start point. Hot sunny day, walk with my 12 year old son, distance ~19.5Km, ascent 740m.VirtualMountain20/04/2019
1st of 7 for day on Black Dragon Challenge out of Crickhowell. Minor rise on ridge running N. Very small pile of stones at summit.richardrosser06/04/2019
Llanbedr horseshoe. Slight blast of hail on top.RedAndy5402/04/2019
along the ridge from Pen y Gadair Fawr. Compass out due to low cloud. On to Crug Mawr.DanMaisieBex30/12/2018
Crickhowell - Pen Cerrig-calch - Pen Allt-mawr - Pen Twyn Glas - Mynydd Llysiau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr - Coed Cefn - Crickhowell.Mark Jackson25/10/2018
Revisit 15 mile run from Llanbedrmilejunkie18/10/2018
Solo. Last hill of the day. Walked further southwards down the ridge and descended to Blaenau.Dangerous Dave16/09/2018
With JackW. Waun Fach Horseshoe CW. From Llanbedr. masmith28/01/2018
Nick and Julesrockwarrior23/07/2017
Circular hike starting from layby at Llanbedr to tick off Crug Hywel-Trwyn Ysgwrfa-Pen Cerrig-Calch-Pen Allt Mawr-Pen Twyn Glas-Mynydd Lysiau-Waun Fach-Pen y Gadair Fawr-Pen Twyn Mawr-Crug Mawrmanilena24/06/2017
Included in circular walk from bridge near Neuadd Farm, GR 234229, start with Pen Cerrig Calch, finish with Pen Twyn Mawr and down Pen Gwyllt Meirch and round to bridge start point. Once you have slogged and reached Pen Cerrig Calch summit you have basically gained the height. Mostly a leisurely stroll from then on. Start 10.30am finish 5.30pm. Can easily be done in less.Dewi Prysor13/05/2017
TD & CThis Dog16/04/2017
soloAimless Rambler15/04/2017
Good visibility.Hammy15/04/2017
Llanbedr horseshoeejjohnstone15/04/2017
Nuttall Walk WN 12.2 The Western Black Mountains from Cwm Banw. Pen Cerrig-calch, Pen Allt-mawr, Pen Twyn Glas, Mynydd Llysiau, Waun Fach (811), Pen y Gadair Fawr and Pen Twyn Mawr. 21.7km with 950m ascent in just under 7 hours. (S)silveracorn_alan09/04/2017
Solo No 5 of 6rock197409/04/2017
with roger and a group from walking in the BreconsDarren-44311/03/2017
Walked up through the woods then along the top. Almost unable to stand up due to the wind.Neolith20/08/2016
Walked up through forest from Blaen-y-Cwm car park to Pen Twyn Mawr then walked along the ridge to Pen y Gadair Fawr before heading back down to the valley. Warm sunny day, around 12.5km/8miles walked in total, with two sons aged 13 and 10.clyoung02/06/2016
Nuttall walk 12.2: Pen Cerrig-calch - Pen Allt-mawr - Pen Twyn Glas - Mynydd Llysiau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawrronaldo33304/05/2016
On a JJ trip staying at The Dragon's Back bunkhouse, onwards then ending up in Crickhowell.Lou30/04/2016
horseshoeunderhill05/03/2016
Second hill on a circuit from Llanbedr going via Waun Fach.Cas-gwent14/10/2015
ANOTHER DAY OF GLORIOUS WEATHER WITH VIEWS FROM THE BEACONS TO THE SHROPSHIRE HILLS. FOLLOWED NUTTALLS WALK 12.2 UP VERY STEEP HILLSIDE (ARCHERS OMNIBUS ON I-POD) AND OVER PEN CERRIG CALCH, PEN ALLT MAWR, PEN TWYN GLAS, MYNIDD LLYSIAU,WAUN FACH,PEN Y GADAIR FAWR AND PEN TWYN MAWR. NEW PATH UP WAUN FACH AND ON TO PEN Y GADAIR FAWR MADE GOING EASY AND FOUND GOOD PATHS FOR DESCENT.BURGESS07/06/2015
With Ben, Ian, Keith & Mick from Bassetlaw Hill & Mountain Club taking part in Wateraid 200 Mountain Challenge, doing the Llanbedr Horseshoe. Sunny and breezy - Seventh peakalwaysinshorts06/06/2015