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Name:Bwlch Mawr
Hill number:1953
Height:510.3m / 1674ft
Parent (Ma):1952  Gyrn Ddu
RHB Section:30A: Anglesey and the Lleyn Peninsula
County/UA:Gwynedd (CoU)
Catchment:Minor Rivers only (South)
Class:Hump, Dodd (500-599m), Dewey, Submarilyn, Clem
Grid ref:SH 42673 47851
Summit feature:large boulder 12m ESE of trig point
Col:365m  SH414466  
OS map sheet(s):(1:50k) 115 123
(1:25k) 254
Observations:rock outcrop 135m SSW at SH 42643 47721 is 0.35m lower
Survey:Leica NA730/Leica GS15/Trimble GeoXH 6000
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 129 users)ByDate of Ascent
Gyrn Ddu > Bwlch Mawr [S7437] from GR: SH 43727 47789ronaldo33311/07/2020
Gyrn Ddu > Bwlch Mawr [S7437] from GR: SH 43727 47789Hippster11/07/2020
With Gareth from the Clynnog Fawr Road to the East of the hill. Gyrn Ddu first then Bwlch Mawr (and its handsome trig) on the way back.briandavies19/03/2020
Tony J25/08/2019
Robert Kemp10/07/2019
HP is blocky rock outcrop near trig; cairn S of wall is lower. Approached via muddy RoW (path) from Clynnog Fawr with interesting 7th C well and St Beunos Church. Superb sunny views of coast ,sea and wild sheep pasturesDenise 08/04/2018
From Clynnog Fawr by the wet and muddy bridle way then rough grass of hillside. Excellent views from summit.RichardM08/04/2018
Up and down from the radio mast. Anxious twenty minutes as dropped car key before half way up. Kept going though. Such is this bagging obsession. Found it.Eddie10/01/2018
Me Alf and Darryl.jrj27/10/2017
From Gyrn Goch on a CW circuit of 6 hills, on to Pen y Gaer. Parked at entrance to Ynys Ddu farm (SH 3971 4523). Nice top.jonglew08/09/2017
Anticlockwise route over 5 tops of the group. A very fine summit. Very rough going.stig_nest20/07/2017
From road to East by transmitter, en-route to Gryn Ddutim74707/06/2017
With Trefor. From Aerial to the east. Straight to summit. On to Gyrn Ddu after.Back via public footpath to the south. Great views and good weather.mike.hoult07/04/2017
From mast at 437478 and W on Llyn Coast Path (not very clear to begin with), heading to top after first wall. Crossed wall stile in the corner to access the trig. Then on to Pen y Gaer.milimana02/03/2017
4/4 Last of four on misty day (Foel/Mynydd Cennin/Moel Brnmoid/Bwlch Mawr)Fergalh22/01/2017
Parked in Llanaelhaearen and climbed Gyrn Du first before coming over to this one. Came down off Gyrn Du the way I had gone up so had a long contour round till I picked up the track. All OK till you hit the mother of all stone walls near the peak. Hope they won some competitions for this one.Father Ted08/10/2016
Parked just below mast 435478 at good space then followed ROW until it dropped slightly. Interesting direct line over rocky bluffs, went to false summit then scaled the wall to visit trig pt and ascend extra 35 cm to claim hill. We walked down W by the wall and found a wall stile- little easier than climbing the wall, and returned using the path to the mast. So clear we could make out Preseli, Wicklow, Mourne and IOM. With Petepwheeler20/09/2016
A difficult 3hrs walk with Christopher H in cloud over the 3 tops of the Gyrn Ddu group. The bridleway from Clynnog Fawr past Pen-yr-allt-uchaf was severely overgrown. Easier once on the fell, though no path. Wall near summit must be climbed. Easy going following wall S to ROW.Mark Jackson24/08/2016
Parked at end of farm track for Llethr-ddu then followed row to Fron-heulog. Straight ascent to Gryn Ddu with slippery boulder hopping at end. Descended east then north and up Gyrn Goch then back and round by walls to Bwlch Mawr (best 'stile' is 100m to west). Returned by row but diverted to take in Moel Bronmiod cutting down directly to Llthr-ddu on descent.SS07/08/2016
Circuit including Gyrn Ddu and Gyrn Goch. Started at 438475. Followed path W in thick mist, GPS came in very handy as strayed from the path many times. Summit very rocky, fine views especially towards sea.JamesD197218/07/2016
A direct ascent from the mast at SH437478 bagging Bwlch Mawr,Gryn Ddu and Gyrn Goch.mad max12/07/2016
Parked at end of farm track at SN39710 45239 (Room for 3 cars) – Up farm track & path to deserted houses on waymarked track – Gyrn Ddu – E. down to col & waymarked track – N. alongside wall to rocky summit (JL)gerrybowes03/07/2015
With Jenx on the Marilyn circuit. Fine hill this.nordicstar24/06/2015
from E at mast 435478 and on to Gyrn Ddu in mist and rainThearlaichdubh20/06/2015
On a circuit from Clynnog Fawr with Sue, on a fine day.Phreerunner20/11/2014
Start ~ 405487.Used Row alongside the Afon Hen to gain the hillside before following the walls up to the summit of Gyrn Goch, a somewhat sporting ascent. Moved on to Gyrn Ddu and then walls and paths to Bwlch Mawr. All the summits are rocky with great views, took a direct descent to follow forest edge to meet outward route. With Wombourne.steve hudson21/04/2014
Parked at GR 405487, room for several cars on section of old road. Took path alongside stream through wood eventually out onto open hillside. Climbed extremely steep grass hillside by wall to Gyrn Goch then on to Gyrn Ddu. Continued to Bwlch Mawr. Excellent views. Descended to edge of forest eventually joining outward route back to car. With SH.wombourne21/04/2014
jim pererin08/04/2014
A direct ascent from the mast at SH437478.Chris Peart19/01/2014
Colin Crawford19/01/2014
Pant Glas to llanaelhaearn. Slow going bouldery terrain.Smudge30/11/2013
Campbell Singer21/11/2013
Survey/walk with Mountain Views team. Roadside parking for 2 or 3 cars at SH437475.webmaster31/08/2013
joint survey with MountainViews Galltywenallt31/08/2013
From SH 437 477.summitsup18/07/2013
Bwlch Mawr, Gyrn Ddu and Gyrn Goch. Parked on A499 and ascended via the forest. Tough ascent of Bwlch Mawr with no path.clivevilla15/02/2013
With Mora, from minor road to EastBLACKHILL15/02/2013
Pleasant day out visiting Lleyn HuMP's and trigs.Alex C12/02/2013
From Clynnog-fawr, up an overgrown bridleway to access land.Sprog08/09/2012
with Jamie, intersting clockwise cicuit that ended with uncomfortable push through thickening increasingly high gorse on the lower NW slopes of Gyrn Dduvegibagger05/05/2012
From Gyrn Ddu.davidpettit8419/06/2011
Martin R05/03/2011
From East path. Do best to follow path until after stiles and gates reach a solid wall. At N end there is a large gap in it next to a stile. After gap grassy to top. If not this way tricky boulder fields. Guess which way I went up!destaylor26/02/2011
Alan Whatley22/08/2010
Andy West18/08/2010
Circuit from Clynnog Fawr with Gyrn Ddu and down via Gyrn Goch. Variable weather - no rain but both summits deep in cloud. Stone walls aid location of summit trig.nosdrahcir04/08/2010
Steve Q13/09/2009
andrew brown30/05/2009
carole engel31/01/2009
Colin Crawford12/11/2008
Phil M17/08/2008
morning walk along with gyrn ddu - sunny over lleyn, cloud beyon heboggigglejon30/03/2008
Revisit date. First date not recorded. see log on RHW27/05/2007
Neil Midgley18/04/2007
John Kleiser01/04/2007
Edwin Gradwell29/10/2005
David Gradwell29/10/2005
George Gradwell29/10/2005
Arrived here from Gyrn Ddu on very easy going pathsgaryhoney03/05/2004
Climbed in a fierce freezing wind, in sunshine.Man of Kernow123/02/2002
Sunday evening ascent after working on JG pre-exp w/end at Cobden's. Hot -bare top. Feeling tired.My log tells me I first visited the trig in the middle of Canaerfon- and one on the beach which had gone I have no memory of this, but is the sort of thing I did !Chris Pearson01/07/2001
From east conbined with Gym Ddu while locuming in Caernarfon.Dugswell204/11/2000
On path over 2 stiles and 2 wire fences into cloud. Swampy section and more rocks. Flat tussock leading to final rocky outcrop. Large wall 20m from column. English welcome in Wales but don't stay - painted on column.arranc18/07/1999
David Purchase07/05/1998
From Clynnog-fawrAlan Moore20/07/1996
With DGJohnIvor19/11/1995
Date unknown RHW01/01/1990