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
Catchment:Minor Rivers only (South)
Class:Hump, Dodd (500-599m), Dewey, Submarilyn, Clem
(Hu,Tu,5,Dew,sMa,Cm)
Grid ref:SH 42673 47851
Summit feature:large boulder 12m ESE of trig point
Drop:147.6m
Col:362.7m  SH 4143 4664  
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
A Performance Evaluation Trimble GeoXH6000 vs Leica Viva GS15.pdf
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 156 users, only the latest 50 shown - Show all)ByDate of Ascent
First in a 4 hour circuit of this top, Gyrn Ddu and Gyrn Goch starting and finishing from Clynnog Fawr. Only met 2 people in all that time, despite wonderful walking conditions, cool, dry and sunny.desperate dan20/04/2024
From Pen-y-Gaer, following an ATV track for a bit, over a few walls. Descended W to top of path by wood, then down interestingly across steep slopes through the trees, via Cwmgwared.Minto16/07/2023
A fine circuit of five hills from the A499 at Gyrn Goch. Summited this one with Jill & Minto. Gyrn Goch / Gyrn Ddu / Moel Bronmiod / Pen-y-Gaer / Bwlch Mawr. Lovely path down through the woods to Cwmgwared.Dangerous Dave16/07/2023
From the mast on the east side. At my age the walls were a bit difficult to negotiate and the fence lower down. Met a Dutch couple on top and now they know what a Dewey is!Solo.bolton24/06/2023
easy park to east near mast started on row path not where map shows, stile over wall 100m west of summit of Bwlch Mawr then Gyrn Ddu and Gyrn Coch return east using row some big stone walls however plenty of breaks no need to climbunderhill29/12/2022
From Trefor for a round of Gyrn Ddu, Bwlch Mawr and Yr Eifl.rhalstead29/12/2022
Bwlch Mawr , Gyrn Goch and Gyrn Ddu about 3 hrs 30 from parking near mast to east . Always wanted to walk these hills, but the clag was down and it was blowing a gale. Their rocky tops were quite forboding with little visibilty . And route finding a bit tricky. Must go back again in decent weather.Mark Sims11/11/2022
From street parking in Clynnog Fawr using ROW to reach open hill side, after reaching Bwlch Mawr I crossed the stile near the summit and followed a path by the wall around the valley head not losing to much height all the way to Gyrn Ddu retracing my steps back to the start. Just under Seven mile in Four hours twenty.WAYNE ROWLETT20/08/2022
510mThe Grouse27/12/2021
Parked in a big layby along the road just past Pen-sarn.A very rainy day! Used the footpath all the way up, very straight forward. The summit is further back than you can see. You have to go over a wall if you want to visit the trig point. The views are probably good on a clear day.Skarletk02/10/2021
A circular walk visiting Gyrn Ddu, Gyrn Goch & Bwlch Mawr, from the small parking area at SH 397 452. Returning via the footpath to the south. A splendid summit as commented on by others. Good stile over the big wall about 300m north of the summit. 12km with 550m ascent in 3h30m. (S)silveracorn_alan17/09/2020
From transmitter mast.PGCE18/08/2020
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
https://www.strava.com/activities/4195048902Sleepwa1ker15/09/2019
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
petey16/11/2014
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
A direct ascent from the mast at SH437478.Chris Peart19/01/2014
Pant Glas to llanaelhaearn. Slow going bouldery terrain.Smudge30/11/2013
KeithByTheC20/09/2013
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