Add marker to map:              help
Marker Notes X

To add your own marker to the map, click on the appropriate symbol below the map, then click again at the location required on the map (using the crosshairs).

Logged-in registered users only...
When you add a marker, a pop-up box should then appear on the map - fill in the elevation (if known) and a brief description of your marker, then click [save].

To view previously saved markers which fall within the bounds of the map, click the show link (you may need to repeat this if you zoom or pan away from the current position on the map).

Name:Rhos Ymryson
Hill number:2221
Height:327m / 1073ft
RHB Section:31C: South-West Wales
County/UA:Cardiganshire [Ceredigion] (CoU)
Class:Marilyn, Hump, Tump (300-399m), Clem
Grid ref:SN 46038 50017
Summit feature:ground by covered reservoir
Col:163m  SN617579  
OS map sheet(s):(1:50k) 146
(1:25k) 198E
Observations:ground in field on S side of reservoir is c 1m lower
Survey:Abney level
Change log:show changes for this hill entry
GPS data:show GPS entries for this hill

Show Map
(Please be considerate with your usage of the OS map pages, as there are daily limits)

View on: Geograph  OS Maps  Streetmap  Magic  NLS  OSM

Full screen map
Switch to Bing Maps view
(Please be considerate with your usage of the Full Screen/Bing Maps pages, as there are monthly limits)

Resize map: portrait / landscape / reset

Map Help, This page uses the Ordnance Survey OpenSpace API
which does not include Explorer (1:25000 scale) mapping.

Show/hide GPS File for mountains/markers shown

Show/hide GPX File for mountains shown

No summit photo available
Hill summit
No portrait photo available
Hill portrait

To contribute a summit or portrait photo for a hill
please contact the hillsummits website

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 148 users)ByDate of Ascent
From Layby to the north, 2/9 Marilyn. Quick dash up the cow filled field and onto summit structure.N.Morters24/07/2020
Up from the layby on a horribly wet and muddy path. Gate to compound locked but wandered round and scaled the gate at the rear to get to high point. Horrible experience on very inclement weather.NormanW24/02/2020
From layby to the north, up track. Harassed by locked mesh gates and cattle. Summit is an underground reservoir compound defended by mesh fence all the way round, got over but only just. Exit compound by NW corner and down the bridleway, no path, long grass and numerous gates. A fine viewpoint, they should encourage access.Topographer5706/09/2019
With: hb; We couldn't park in the layby as Highways were shifting large quantities of gravel from it. We parked near the junction to the west, then walked up the Water Authority track by edge of field. We couldn't get directly to the NE corner of the compound because cows were filling the track between the fence and an electric wire fence around a hay crop, so we hopped over the latter to the NW corner, then cicumnavigated the compound before returning from NW corner down to the bridleway back to the road.Ian Baines29/07/2019
With: ib; We parked near the junction to W as Highways moving gravel from layby. Walked up track by edge of field, then over electric fence to NW corner, circumnavigated compond then down to bridle track & return. Helen Baines28/07/2019
Not optimal timing today as a four vehicle farming convoy arrived in the field just before me. After a little bit of pontificating I decided to go straight up to them and enquire whether it would be ok to visit the hilltop. No probs whatsoever and it always feels best to ask :).Alex C12/01/2019
Pretty rubbish way to spend a drizzly Christmas morning, especially as the field with access track was full of over-inquisitive cattle so had to go up parallel field edge and cross bwf when out of their sight. Walked round the compound like others but definitely the sort of hill that is never visited twice.milimana25/12/2018
Lay-by parking at SN 459506.Isbjorn12/11/2018
Short walk from the layby on the B4338 to the summit reservoir gate from where I operated ham radio for SOTA.G4OBK (Phil)15/04/2018
A bit of a daft hill really. Easy walk up the track to the reservoir, then a circumnavigation of the perimeter fence to find highest non-man-made ground. Looks easy to get in to the high ground inside the now secure fence but it is is only a bing, the footholds are not accessible for the return climb, and big brother is watching you....Gill11/01/2018
Walked up the track to the reservoir, bit misty for good views today.Neolith28/10/2017
Parked at layby at bottom of waterboard track. Overcast, dry, mild, calm and good views.iangalbraith07/07/2017
Quick bag by nipping up the track to reservoir after a couple of white vans of workmen had conveniently left the site. Went to area to east of the fenced compound as it appears to be the highest non man-made spot.Cas-gwent11/05/2017
Massive lay by opposite gated field entrance on B4338 (SN 45949 50699) giving access to hill top reservoir. Highest point is clearly top of reservoir within locked compound but also obviously man made. Walked all round perimeter fence where looks like highest natural point is on southern boundary near SE corner of reservoir.SteveSmith25/11/2016
From layby on B4338, opposite reservoir access track. Write up at:
From layby on B4338, up reservoir track and over fence into compound.Tony J24/07/2016
Last of 4 Ma and 2 Hu on driving/ short walks day, Rhandirmwyn inc. Crugiau Merched to Pen-crug-melyn to here, then on to Newport (Pembrokeshire). Parked in lay-by at 459507, used reservoir track. Was satisfied that a circuit of the reservoir fence gave the natural top; man made reservoir banks a bit higher. Interesting to get big views N for the first time today, from here: Arans and Arenigs most evident. On the drive over to Synod Inn a view of the Lleyn Peninsula and Bardsey Island opened up.pwheeler27/04/2016
After the snow of Hafod Ithel the drive down to Rhos Ymryson was sunny with blue skies. Pulling into the sizeable layby at yhe foot of the resv track I put the jacket on out of habit. By the tine I arrived at the compound I was in the middle of a hail storm. Ok West Wales.. not funny now! Trudged around the inside of the compound cursing my luck.stig_nest09/04/2016
Parked in lay-by 458507 followed footpath, wellies essential as it was flooded. Followed reservoir track down which could have done in trainers which come out opposite lay-by.CodyleCoyote17/02/2016
Car parking almost opposite entrance to reservoir trackjimbloomer17/01/2016
1/4 Quick walk up to reservoir Nice views.Fergalh09/08/2015
With Jenx from layby opp track. Used this to gain compound. No one around, work finished. Easy climb over gate as required but high point looks at SE corner of fenced area near gorse bushes.nordicstar03/04/2015
Parked at 459507 for a short walk to the covered reservoir. We were watched from the huts on the site but let them guess what we were up to. Access on the S.E. corner to the high point. A small gate was open out of sight from the workers. A very uninspiring top. GB agrees.bolton05/03/2015
Parked in layby to N. (SN45953 50700) Up farm track, over a small fence & made way to SE corner of compound Over another small fence & through unlocked rear gate to enter the compound and locate the summit. (PM)gerrybowes05/03/2015
With Trefor. Footpath from road then across fields to top. Contractors working on reservoir but gate unlocked. Got on top of the reservoir before we were challenged and told we were not allowed on site. Agreed to depart as we had by then achieved our objective. Back along access track.mike.hoult03/12/2014
Good roadside parking on B4338. Up access track to large covered reservoir, looks like it's had a major overhaul recently - all except the poor security fencing.jonglew06/09/2014
Up from the road on way from Aber to Cardiff. Driven near this way thousands of times on the way to my grandparents. Shows what hill-bagging gets you up to!huwthomas30/06/2013
lots of workmen all round reservoir - got as close as I couldgigglejon18/12/2012
Up waterboard track. There were open books on the desk in the building so I was happy not to be shooed away.clivevilla15/11/2011
Up through the field. Encountered friendly farmer on return turning ewes into three week's grazing before lambing.Eddie24/02/2011
Up waterboard track - reservoir compound padlockedG4OWG30/09/2010
15-min walk up track to reservoir. Lots of buzzards and kites on fine morning.Summit was flat roof of reservoir. dbb17/06/2010
G My T DadIdris14/04/2009
Parked in lay-by to north on B4338 and took footpath, then thro' gate on to hillside. Handy damaged area of fence to allow access to reservoir. The reservoir roof would take the whole Welsh and Irish rugby teams at same time.Dugswell221/03/2009
I liked this one though it was an easy stroll up the track to the resevoir. Nobody at home in the hut today.Father Ted26/08/2008
From N pleasant evening stroll.destaylor14/08/2008
Track from N leads to large covered reservoir, flat on top of course.Aye Jimmy22/07/2008
Wierd to find a reservoir on top of a hill. Couldn't climb onto top of hut on top of this tho' sign "Danger: Fragile Roof" suggests some bagging nutters had tried.signyred08/07/2006
We ascended this hill from the north - near the road junction. A vehicle track runs to the summit.ChinnockC10/04/2002
A 7 'easy marilyns 'drive and dash around S.W /Mid Wale after JG leaders meeting on Anglesey at HMS Indafitagble - a shore base. Slept in car-rocking in wind. Some remote lovely valleys. suffering again from a re-occurrence of a tooth infection-drugged. Then drove to Alan & Jo's in Knutsford (Rob, Lesley, Robin there)Chris Pearson22/01/2000
From road over 6' wire fence to top of covered reservoir.arranc01/05/1999
Date is first visit. Notes from later...dull hilltop crowned with security-fenced service resr. resr tk from B4338@458507 RHW23/01/1999
Tony Wilson09/08/2016
Tony S03/12/2015
Mark Sims17/11/2015
carole engel20/04/2015
Tom Mundell12/10/2014
Trekking toes10/10/2014
Lionel Bidwell23/04/2013
Susan Bidwell23/04/2013
Rob Pen y Garn24/04/2012
GWR Chris23/12/2011
Steve Q07/08/2009
Owen B16/06/2009
Alan Whatley01/10/2008
Edwin Gradwell16/03/2008
David Gradwell16/03/2008
andrew brown23/02/2008
Martin R16/06/2007
Campbell Singer03/02/2006
Man of Kernow127/12/2005
Denise 22/10/2005
Colin Crawford30/09/2005
Jon F11/09/2004
David Rawden26/09/2003
Chris Peart03/01/2000
David Purchase15/09/1998
Rob Rees13/09/1993