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Name:Cefn y Cylchau
Hill number:3521
Height:556m / 1824ft
Parent (Ma):5603  Fan Brycheiniog - Twr y Fan Foel
RHB Section:32A: Llandovery to Monmouth
Nuttall/Wainwright area:Brecon Beacons
County/UA:Carmarthenshire [Sir Gaerfyrddin]
Catchment:Towy
Class:Dodd (500-599m), Dewey
(Tu,5,Dew)
Grid ref:SN 75738 19725
Summit feature:small cairn
Drop:38m
Col:518m  SN757190  
OS map sheet(s):(1:50k) 160
(1:25k) OL12W
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 103 users, only the latest 50 shown - Show all)ByDate of Ascent
From Mountain Road car park (SN 7325 1878). Followed good track (marked on 25k map as a RoW) for 1km before peeling off heading NE on a direct line to here. On to Carn Fadog and the Ffrydiau Twrch Chimney (remains) for a 13.2k round.jonglew09/01/2024
First I climbed Garreg Lwyd (616m) and trigpoint, the onto Foel Fraith (602m). From there I took a detour to Carn Fadog (512m). Then onto the highest and most outlying summit for today, Garreg Las (635m) and then onto the trigpoint and summit which lies beyond, Carreg Yr Ogof, a beautiful spot. Time was getting on but I managed to include Cefn y Cylchau (556m) on the way back and a fairly direct route back to Herberts Quarry allowed me to finish in daylight. A very scenic walk in this remote area. /Dmeltdiceburg23/10/2023
Cefn y Cylchau from GR: SN 73862 19686ronaldo33318/06/2023
Cefn y Cylchau from GR: SN 73862 19686Hippster18/06/2023
In from the Mountain Road.Arbie12/04/2023
A4069 summit parking area - Garreg Lwyd - Foel Fraith - Garreg Las - Cefn y Cylchau - Carn Pen-rhiw-ddu - car.Mark Jackson29/10/2022
22.5 mile 3794ft walk, start at Dan Yr Ogof Show Caves Camp Site, follow track NW from campsite upto Twynwalter,Carreg Yr Ogof TP, Garrag Las, Cefn Y Cylchau,Garreg Lwyd,Foel Fraith and Tyle Garw, return East accross moor to rejoin path back to Dan Yr Ogof.stephenbuda18/04/2022
Walk in the Black Mountain range, paths not as clear as other parts of the Brecons, but that gives a bit more adventure! Mountain pass car park had plenty of spaces, and a good place to start a walk.JazDisney26/06/2021
From the small parking area at Pont Clydach.PGCE01/04/2021
Started from the quarry in atmospheric misty conditions. Climbed up the west flank. Tussocky moorland. Amazing to find a squirrel at the top. Must have lost his nuts. With Jemma.Campbell Singer13/09/2020
First of three. A grey squirrel at the top but no trees.Jemma Singer13/09/2020
From CP on pass to west. Garreg Lwyd, Foel Fraith, Garreg Las, Waun Lefrith. Back via Cefn y Cylchau. With B and R.jenx12/09/2020
Out and back from Foel Fraith, gentle approach, a few stones mark a summit, then land drops quickly to northrichardrosser01/08/2020
5/6 Dewey day. From the car park at the summit of the A4069, visiting Garreg Lwyd enroute to Foel Fraith, then on to Garreg Las. Then returning around the top of the steep slope above Blaen y Cylchau, before heading north to Cefn y Cylchau. The return to the A4069 roughly followed the Beacons Way. Then a quick up and down Carn-Pen-rhiw-ddu from the car park. 16.6km with 560m ascent in just over 4 hours. (S)silveracorn_alan22/07/2020
From the car park at the high point of the road to the E, over Garreg Lwyd, Foel Fraith, Cefn y Cylchau and Carn Pen-rhiw-ddu. With JT.Sprog20/07/2020
From Foel Fraith. Headed north to Blaenclydach, continuing in the same direction to the summit. Then descended west to Pont Clydach. With MP.Man of Kernow106/05/2018
Dewey walk from the free parking area on the A4069 in grid SN73 18. Route was upto Garreg Lwyd east to Foel fraith then north to reach Cefn y Cylchan. Returned to car via open ground to the east to reach the road and followed this back to the car.WAYNE ROWLETT19/08/2017
Parked up near the quarry and walked along below it past the waterfalls then up to Cefn y Cylchau before looping back and along to Carreg yr Ogof and Garreg Las. Stunning limestone area, shame about the weather today!Neolith16/04/2017
11 mile walk on easy grassy terrain from viewpoint on pass, walked down road to the bridge over the Afon Clydach, climbed up steep slopes to Cefn Y Cylchau, headed SE from summit hitting the only bog patch in the area and picked a route up through rocks onto Garreg Las and along ridge to summit, descended to Carreg Yr Ogof trig, then back over Garreg Las and along Beacons way over Foel Friath and Garreg Lwyd down to pass and up to Carn Pen-Rhiw-Ddu, back down to car. Afterwards drove round to bag Trichrug and Carn Goch. Nice weather, high cloud and fairly strong winds. Great clear views of Swansea, Port Talbot, Exmoor, North Devon, Lundy, Gower Peninsular, Presili Hills and Drygarn Fawr.DanTrig15/04/2017
Foel Fawr, Garreg Lwyd, Foel Fraith, Garreg Las, Carreg yr Ogof, Cefn y Cylchau with my 14 and 11 year old sons. Started and ended at the Black Mountain car park. Mild April day, with sunshine and cloud and a light wind.clyoung11/04/2017
Large car park at 732187 - Up roadway to top of quarry & then along Beacons Way before heading up gentle slopes to summit cairn - Continued to Foel Fraith & Garreg Lwyd. (PM CM)gerrybowes25/01/2017
From the car park at 732187. Good underfoot past the quarries. Very dry, sunny and clear. South to Foel Fraith with GB and CJM.bolton25/01/2017
Car park at 732187 - along track to top of quarry & then along Beacons Way then up slope to summit cairn. Continued to Foel Fraith & Garreg Lwyd. 1/8 cloud, strong S'ly wind. With GB & PM.CJM25/01/2017
Tump nbr 500 for 2016Adrian20/11/2016
Walked over this hill a number of times. This time I am sure I reached the top.Dusty25/07/2016
from Foel Fraithunderhill21/11/2015
1/6 First top on wonderful clear day (Cefn y Cylchau/Foel Fraith/Gareg Las (Twyn-swnd)/Tyle Garw/Pen Bwlch y Ddeuwynt/Garreg Lwyd (Moel Garnach)Fergalh02/08/2015
From the quarry car park up over Garreg Lwyd and its well-built cairn then on to Foel Fraith following Beacons Way. From there on to Cefn y Cylchau before returning direct to the quarry and round to the car park on surprisingly easy ground.SS14/03/2015
Climbed from the west as part of a loop of Garreg Lwyd, Foel Fraith,Cefn y Cylchau and Carn Fadog in cloudy, rainy weather.JohnStoneham05/08/2014
Garreg Lwyd, Foel Fraith, Carn Fadog, Tyle Garw, Pen Bwlch y Ddeuwynt, Garreg Las, Foel Fraith (again oops!) Cefn y Cylchau, Carn Pen-rhiw-ddu.ijpowell25/04/2014
Night hike with Chippy Explorerswychwood29/07/2013
Easy walk from A4069 and quarry to west, just a small boggy bit at 743 189.dicky26/05/2013
Easy parking on main road. 2265 3521 7658 mainly grass - pleasant walk.destaylor16/05/2013
A round of Garreg Lwyd, Foel Fraith, Cefn y Cylchau and Carn Pen-Rhiw-ddu. Rough followed the Beacons way with a few detours.rhalstead01/04/2013
Start ~ 732187. Done on a route over Garreg Lwyd and Foel Fraith. With Wombourne.steve hudson15/07/2011
From car park at SN 73294 18734. Circular walk including 4 tops as Clive Richardson.David Gradwell27/05/2011
Walk with Gpspearing14/04/2010
Walked up Garreg Lwyd from car park at highest point of road. Combined it with three Dewey's - Foel Fraith, Cefn y Cylchau and then, across the road, Carn Pen Rhiw Ddu. There is now a small cairn on top here.clivevilla03/05/2009
Galltywenallt27/05/2007
grassy summit. A4069 pass RHW18/04/1998
After morning visit to Himalayan Kingdoms in Bristol. solo bagging spree of 2000ers and Marilyns. Nice circular run from road top over tops to Gareg Las further east then back over this hill.Chris Pearson04/07/1997
see Foel Ffraith logpwheeler04/04/1997
Bump on route keeping to drier high groundRhayader_wander28/02/1988
Climbed from east face straight up cliff grassy Plateau is summitfreethehilltopsblank
Matt20/12/2023
Minto05/11/2023
Alex C05/11/2023
TK05/06/2023
IainT15/12/2021
salen10/10/2021