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Name:Mynydd Maen [Mynydd Twyn-glas]
Hill number:2292
Height:472m / 1549ft
RHB Section:32C: Neath to Chepstow
County/UA:Caerphilly, Torfaen
Catchment:Usk
Class:Marilyn, Hump, Tump (400-499m), Clem
(Ma,Hu,Tu,4,Cm)
Grid ref:ST 26001 97850
Summit feature:knoll 35m N of trig point
Drop:253m
Col:219m  ST227988  
OS map sheet(s):(1:50k) 171
(1:25k) 152
Observations:knoll is 50cm higher than base of trig point; knoll 30m WNW of trig point is 30cm higher; trig point is at ST 25996 97816
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 276 users, only the latest 50 shown - Show all)ByDate of Ascent
SOTAmike.hartley11/02/2024
As others, parked in the large parking area off the minor road bend to the W and followed the track up to the trig and hp. Lovely cold clear evening. Descended in the dark disturbing the cows on the track. Solo.richard6927/11/2023
From large parking area at bend in road to the west. Good road all the way to the trig. High point nearby on heather mound. With Jill.Dangerous Dave06/11/2023
With Ian, Alan, Richard and Milo.Munroist393508/10/2023
Cambrian Way Day 2 (detour)benwloudon12/02/2023
On a visit to Cwmbran so I planned a nice little 13mi run incorporating visits to the summits of Twmbarlwm, Medart and Mynydd Twyn-glas. Parked at Henllys Nature Reserve (free parking) and made my way up from there. Twmbarlwm the easiest of the three summits to find; Mynydd Twyn-glas also has a trig point and not to challenging; Medart doesn't really have anything distinguishable, and there's an artificial raised bit near the summit. All in all it was a lovely route in the hills!ewangibb8711/11/2022
From Cwmynyscoi, my local trigdavecnash28/06/2022
From bend in road to west. Enginners in gas compoundnear the summit had left thegate unlocked. The track is particularyrough on feet. Great viewscjo26/06/2022
Parked just after cattle grid 235980 up track to transmitters, walked between them up to a small pile of rocks then left up to abandoned building, back across to trig and returnTribal2er11/04/2022
With KeithbyTheC. 10.1m circuit across Mynydd Twyn Glas and around the ridge to Twmbarlwm. Easy walking, under 4hrs moving time.JulieB22/03/2022
From Cwmcarn. Up steadily rising RUPP heading NE on to Cefn Rhyswg. Then along SE edge of forest on gently rising track. KeithByTheC22/03/2022
Revisit after 1998 … run with Pauline from Cwmbran joining up bit of Cambrian Waymilejunkie10/12/2021
Parked near cattle grid on minor road to W. My 100th Marilyn!paulhilder05/12/2021
Sirhowy Valley Country Park - Mynydd y Lan - Cwmcarn - Cefn Rhyswg - Mynydd Twyn-glas - Twmbarlwm - Mynydd Machen - Sirhowy Valleydavidpettit8420/11/2021
Quick stroll 2.5 k along 4WD track from west, watched by cows as light faded and fireworks banged under starry skies. HP near trig in heather. One of my last Welsh Marilyns.Denise 07/11/2021
Along track from the parking area by cattle grid to the west.Winterfloodian29/08/2021
Run up Cwm Gwyddon.TedCymru10/04/2021
Walked up from Risca via Twmbarlwm, unusual barrelling north easterly wind. Followed track up to pylons and trig point, bit of a trudge but great views from topMaedhros218/09/2020
From track end parking to west. Up on track following the Pylons, nice viewsN.Morters24/08/2020
With M and X from the eastern car park to avoid the pylons. Had lunch just before the mast. Chilly wind but warmed up on way down. Nice hill despite the usual South Wales trail bike scars and the haze which limited the views somewhat.Herbert Anchovy09/08/2020
from car park then east and on to mast tracks, raining no viz no viewsunderhill18/06/2020
Lockdown exercise. Walked up from Cwmbran via incline, old colliery and walked along the ridge. Beautiful dayBracken19/04/2020
3/5 From W in thick mist. Some bikers. Found headtorch. Rounsfell25/01/2020
From Mountain road to the East, up to the mast then tracks to top.NormanW06/10/2019
Cwmbran - Mynydd Twyn-glas - Griffithstown.Mark Jackson05/10/2019
10.45 gentle stroll up from where I kipped the night above upper Cwmbran where a gorgeous waning gibbous moon rose shortly after I arrived.vegibagger21/07/2019
1/3 Pylons. Extremely clear evening so cracking views from the trig.penbet27/06/2019
Walk up from Cwmbran station via a walk along the canal to Sebastopol then up the eastern end of the hill. Nice views of Pen y Fan and the central Beacons, although the flat summit lacks much drama itself. From here I had a pleasant walk south along the ridge to Twmbarlwm hillfort (well worth the visit) before dropping down to Risca to get a bus back to Newport.thesweetcheat01/06/2019
Parked in car-park - keep an eye out for motorbikes on the hill.Stevooo26/05/2019
Decided to avoid the stony track by setting off across the common, where I came across a 'Boundary of Minerals'stone before finding Gill's benchmark close to the masts.SteveG10/01/2019
Parked at Mountain Air car park and followed path up. Great views and beautiful day for it.Hippy7718/11/2018
Dry but a bit chilly - icy puddles on the track above Cwmbran.Speleoprez30/10/2018
Easy hike up from the east, starting from car park a short distance above an open gate to the west of the road.Topographer5702/10/2018
Parked at the Corner and followed the very stony track - can be avoided by walking on the grass. Not a very inspiring hill but apart from trail bikers only saw one dog walkerclimbingkershaw15/09/2018
From cattle grid along track - gate was open so could have driven virtually all the way. Overcast.SS15/08/2018
Parking on the carp park on Mountain Road to the E then easy climb along well marked path. Great views on the way up. Pillar in good condition, great views at the summit, not a soul around :) Clem, Hump, Marilyn, Pedwar, P30 Tump.griefmiester01/08/2018
Followed the pylons up the hill. Counted my way up on a very hot day. Reckoned they are about 100 yards apart. Last bit of path chalky/sandy.elizyanne14/07/2018
1/3 Parked by cattle grid to the west and then followed the track by the pylons. Just one brief appearance by a trail bike and one dog walker, otherwise just us, the sheep and the skylarks. More enjoyable than expected given some previous comments.milimana17/05/2018
4/4 Marilyn day. The Ascent of Mynydd Twyn-glas from the Mountain Road, Upper Cwmbran. 4km in 1 hour. (S)silveracorn_alan08/05/2018
PPip5616/03/2018
From Twmbarlwm north along the ridge path/track across Mynydd Maen to the buildings west of the summit, then east up the path to the trig pillarMariana Trench11/03/2018
An apocalyptic Marilyn? An unpleasant and tedious walk on a stony track alongside a row of pylons, past two masts, and serenaded by the dulcet tones of gaggles of trail bikes. The most exciting part was spotting a benchmark on what appears to be an ancient standing stone.Gill28/01/2018
Along track and pylons from west - easy parking at road cornerMark Sims10/01/2018
OtisGlenford07/01/2018
From car park in Upper Cwmbran via reservoir.lenman28/12/2017
With TJB from car parking to west via easy trackstrimarc215/11/2017
2/8M parking to the west good track all the way to the top.robertphillips09/11/2017
Laborious progress up from the east in the dark, wind and rain slip-sliding about trying to dodge the puddles and not really succeeding.Alex C30/09/2017
Pleasant walk up from the East. Apart from nearly getting run over by some idiot in a trail bike it was a good hill. Fine views South to the Severn estuary.isabelle19/08/2017
Met a public spirited gentleman on top, painting the trig pillar white.ngthack10/04/2017