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Name:Pen y Boncyn Trefeilw
Hill number:2110
Height:646m / 2119ft
Parent (Ma):19413  Foel Cedig
RHB Section:30E: Bala to Welshpool
Nuttall/Wainwright area:The Berwyns
County/UA:Gwynedd
Catchment:Catchment Boundaries, Dee (Flint), Severn
Watershed:Severn Estuary, Cardiff to Cape Wrath, Liverpool Bay
Class:Simm, Hewitt, Nuttall, Buxton & Lewis, Bridge
(Tu,Sim,Hew,N,BL,Bg)
Grid ref:SH 96235 28322
Summit feature:cairn on grassy knoll in field
Drop:57m
Col:589m  SH973278  
OS map sheet(s):(1:50k) 125
(1:25k) OL23E
Observations:about 10cm higher than pile of stones 38m away at SH 96265 28345
Survey:Abney level
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 394 users, only the latest 50 shown - Show all)ByDate of Ascent
Yr Eryr Aur07/01/2024
Linear walk with Jonny on a very wet Tuesday. Returning to the area to reclaim all the welsh Hewitts. (Foel Cedig reclassified).zaul_uk02/01/2024
Dusty03/11/2023
First Nuttall of the day, easy going at this point using the forestry track.simocity15/10/2023
Jill Robertson18/09/2023
With Foel Cedig.Peterb28/08/2023
ThomasSmith_0709/08/2023
DFRYER31/07/2023
JDMCGARRIGLE21/05/2023
jofaire19/05/2023
Walk 7.5KatyT12/05/2023
govanah29/04/2023
danduponty21/03/2023
neilmcoward04/03/2023
With: solo; Nuttalls walk 7.5. Good dry day with light wind and high cloudIan Baines09/10/2022
Updated Nuttall 7.5 from Bwlch yr Hwch: Foel Goch, Trum y Gwragedd (Trum y Gwrgedd), Foel y Geifr, Pen y Cerrig Duon, Pen y Boncyn Trefeilw, Stac Rhos, Cefn Gwyntog North Top, Cefn Gwyntog, Cefn Gwyntog Far North Top, Foel Cedig and Y Groes Fagl. Haxy, dull day, so there weren't even good views to distract from the relentless trudge through heather.Lazylizzie03/09/2022
taff25/08/2022
4th Mountain today. Not the best walk down from Foel Y Geifr, struggled to find a path through the deep heather, headed for the Hirnant col where you can see a track going up the hill. From here follow the road all the way to the next top.Buckleymon15/08/2022
Risked taking my car up the open track. A bit rough in places but driveable with care... From the trackvegibagger07/06/2022
TeasyChris02/06/2022
On the way to Foel CedigMinto25/05/2022
geoffreycurnock18/05/2022
Rob Rees09/04/2022
Jason Lane09/04/2022
GuyF04/04/2022
Jon901803/04/2022
chris.brockwell31/03/2022
Tackled on return journey,by which time some low cloud had cleared, sticking to grassy side of fence. Great views of Arans with fresh dusting of snow overnight.Nick Canute05/03/2022
ceriroberts05/03/2022
See Foel CedigJulieB02/01/2022
From road/track junction at pass. West to Foel y Geifr then north over 612m top and on to Foel Goch and return to pass. Then east along good track to Peny Boncyn Treifeilw use fence to locate) and on to Foel Cedig which took a little bit of searching to find the small cairn.dickscroop03/11/2021
Cwm Hirnant road - Foel Goch - Trum y Gwragedd - Foel y Geifr - Pen y Boncyn Trefeilw - Stac Rhos - Cefn Gwyntog - Cefn Gwyntog N Top - Cefn Gwyntog Far N Top - Foel Cedig - Y Groes Fagl - Cwm Hirnant road.Mark Jackson24/10/2021
With Sam in driving rainsimon and co23/10/2021
https://www.strava.com/activities/6146021730/overviewrhif721/10/2021
https://www.strava.com/activities/5914433314Sleepwa1ker03/09/2021
mnixon04/08/2021
Fabioski27/07/2021
rickeeling12/07/2021
From Foel Cedig. Summit is a bit messy!ger02/07/2021
andrewroberts24/06/2021
Circular 13.7 mile route of serious heather bashing from Aber-Hirnant Picnic area. Foel Goch, Trum y Gwregedd, Foel y Geifr, Pen Cerrig Duon Pen y Boncyn Trefeilw, Stac Rhos, Foel Cedig, Bwlch y Groes-fagl and Foel-y-ddinas. The intial very steep ascent to Foel Goch from the road should not be underestimated!Gwastadros12/06/2021
Ben Rinnes08/06/2021
Rain, rain, rain! A walk out along the track, picking off tops on the way out and back. With B and R.jenx17/12/2020
Smog07/10/2020
New GRThis Dog19/09/2020
The 7 listed high points from the head of Cwm Hirnant to Cyrniau Nod with Rufus. Parked at the top of the pass and used the vehicle track with brief heathery diversions to the high points. Returned along the track, 3 hours.jacobrichmond07/09/2020
PM31/08/2020
Parked by road and straight lined to Foel y Geifr. Due north to Foel Goch, descent to road back to car. Up and along track to Pen y Boncyn and the Devil's Mountain 666 (Foel Cedig)andrew.morel11/08/2020
sebastiencale06/08/2020
Cumbriancyclist31/07/2020