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| Name: | Pen Twyn Glas |
| Hill number: | 2253 |
| Height: | 646m / 2119ft |
| Parent (Ma): | 2229 Waun Fach |
| RHB Section: | 32A: Llandovery to Monmouth |
| Nuttall/Wainwright area: | Black Mountains |
| County/UA: | Powys |
| Catchment: | Usk |
| Class: | Nuttall, Subsimm, Buxton & Lewis (N,sSim,BL) |
| Grid ref: | SO 21303 25738 |
| Summit feature: | small cairn |
| Drop: | 20.1m |
| Col: | 625.9m SO 2072 2538  |
| OS map sheet(s): | (1:50k) 161 (1:25k) OL13N |
| Survey: | obvious summit |
| Change log: | show changes for this hill entry |
| GPS data: | show GPS entries for this hill |
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 561 users, only the latest 50 shown - Show all) | By | Date of Ascent |
| with Y | Fabioski | 11/04/2024 |
| Anti clock wise over Simms from Nuttalls parking spot at hairpin bend. | NormanW | 25/11/2023 |
| Me, Adam and Peggy 8 miles, windy & showers | davecnash | 06/08/2023 |
| Pen Allt-mawr - Pen Twyn Glas - Mynedd Llysiau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr - Pen Cerrig-calch from Cwmdu. 19 miles | Gary Heath | 25/07/2023 |
| From crickhowell | holtsd | 28/05/2023 |
| https://www.strava.com/activities/9149261907 | rhif7 | 27/05/2023 |
| Small but clear summit. | Vulcan | 02/03/2023 |
| Waun Fach horseshoe following Nuttall route 12.2. Pen Cerrig-calch, Pen Allt-mawr, Pen Twyn Glas, Mynydd Llysiau, Waun Fach, Pen y Gadair Fawr and Pen Twyn Mawr. Enjoyable solo walk on a clear sunny but cold day. 6.5 hours | richard69 | 02/01/2023 |
| Grassy tump in between Waun Fach and Pen Allt Mawr | freethehilltops | 24/10/2022 |
| Twmpa, Rhos Dirion, Waun Fach, Mynydd Llysiau, Pen Twyn Glas, Pen Allt-mawr, Pen Cerrig-calch | keithouk | 14/08/2022 |
| 7.9 mile circular from parking space in road corner at Cwm Banw. Followed good path not marked on the map from road corner straight up through field across road and up by woodland to access land. We followed the access land boundary along until meeting the Beacons Way. We then ascended easy paths up to Pen Cerrig-Calch and then followed gentle ridge up to Pen Allt-Mawr. First time I have seen the trig toppled over. It was standing when I was up here last in 2016. From here we followed easy paths onto Pen Twyn Glas descending the Tal Trwynau ridge down to fields and just before reaching farm we followed a signed path (not marked on maps) heading down to the road bend where we parked. All hills bagged for the 5th time. 588m ascent. Saw only 3 people all day as I think the 34c forecast put most people off. Clear and sunny with a surprisingly stiff breeze. With Marco. | DanTrig | 13/08/2022 |
| Cwm Banw car park > Pen Cerrig-calch > Pen Allt-mawr > Pen Twyn Glas > Tal Trwynau > Car Park. | Winterfloodian | 31/07/2022 |
| Figure 8 loop of Castell Dinas, Pen y Grib, Mynydd Llysiau & Pen Twyn Glas | lboutside | 23/07/2022 |
| Waun Fach horseshoe | Barns150 | 18/04/2022 |
| Reviisit 20 mile run with Pauline from Talgarth | milejunkie | 09/04/2022 |
| www.exploringmidwales.co.uk Cambrian Way Day 5. | Rob Rees | 05/04/2022 |
| 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 ROWLETT | 06/03/2022 |
| Small cairn on path on grassy ridge. Now below cloud with view opening up. Onward to Wau Fach and final Welsh Marilyn in group. Interesting 19th C stone boundary markers at end of ridge to N. | 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. | Arbie | 08/02/2022 |
| Circular hike starting from car park on Greenhill Way at Crickhowell town centre to revisit Crug Hywel-Trwyn Ysgwrfa-Pen Cerrig-Calch- Pen Allt Mawr-Pen Twyn Glas-Pen Gloch-y-Pibwr and the Darren, before following the Beacons Way to Foxhall-Twyn-A40 to car park. Total distance: 13.1 miles | manilena | 21/11/2021 |
| Parked as Nuttall route, but descended back to start from here. | sebastiencale | 14/10/2021 |
| Nuttals route | IanHHill | 03/10/2021 |
| Black Mountains horseshoe run. | Dave Ing | 11/09/2021 |
| ellie | Munroist3935 | 03/09/2021 |
| 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! | JazDisney | 12/06/2021 |
| Circuit inc Table Mountain, Mynydd Llysiau, Waun Fach | Ajm0310 | 25/04/2021 |
| Llanbedr Horseshoe Route. | sionbrit | 11/04/2021 |
| Grwyne Fechan horseshoe from layby at SO234228 | AndrewP | 03/04/2021 |
| 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. | jenx | 09/09/2020 |
| 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) | Joel451 | 28/10/2019 |
| 18.6 miles, 2834ft Table Mountain Walk. | stephenbuda | 24/08/2019 |
| As part of Beacons 100. Apocalyptic weather. | Jim T | 09/08/2019 |
| 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. | VirtualMountain | 20/04/2019 |
| 5th of 7 for day on Black Dragon Challenge out of Crickhowell. After route via Mynydd Troed and Mynydd Llangorse, climbed from Pentre in valley to W to ridge crest and a little further to minor summit. | richardrosser | 06/04/2019 |
| Ascent with my son of Pen Cerrig-calch (701m), Pen Allt-mawr (719m), Pen Twyn Glas (646m), from Llanbedr. Cloudy day, little breeze, some patched of hill fog. ~13Km, with 620m ascent. | VirtualMountain | 27/12/2018 |
| 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 Jackson | 25/10/2018 |
| Solo. From Pen Allt-mawr. | Dangerous Dave | 16/09/2018 |
| With JackW. Waun Fach Horseshoe CW. From Llanbedr. | masmith | 28/01/2018 |
| Nick and Jules | rockwarrior | 23/07/2017 |
| 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 Mawr | manilena | 24/06/2017 |
| 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 Prysor | 13/05/2017 |
| Linear walk from Cwmfforest | Taz38 | 02/05/2017 |
| With Ken, Rita, Karen, Nathan and Bryan. Had to split here as it was realised the start had been too late and pace too slow for them to have any chance of finishing the circuit in daylight. Left here solo at 1500. | Aimless Rambler | 15/04/2017 |
| Llanbedr horseshoe | ejjohnstone | 15/04/2017 |
| 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_alan | 09/04/2017 |
| with roger and a group from walking in the Brecons | Darren-443 | 11/03/2017 |
| Tready's Stag weekend - Day 1 Circular route from Llanbedr | cwrci | 13/01/2017 |
| Climbed as part of a 20 mile round trip with Neil. | Mc101p | 07/01/2017 |
| 11 mile circular over Pen Cerrig-Calch, Pen Allt Mawr, Pen Twyn Glas and Mynydd Llysiau, bright and sunny but very very windy. 4th time on Pen Cerrig-Calch and Pen Allt Mawr, 2nd time on Mynydd Llysiau and 1st time bagging Pen Twyn Glas. | DanTrig | 26/12/2016 |
| Parked up by the waterfall on the hairpin bend. Walked up the lane, then over tal-y-maes bridge up the track to the cwm. Then along the top all the way down to table mountain. | Neolith | 13/09/2016 |