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Name:Castell Dinas
Hill number:15616
Height:450m / 1476ft
Parent (Ma):2229  Waun Fach
RHB Section:32A: Llandovery to Monmouth
Nuttall/Wainwright area:Black Mountains
County/UA:Powys
Catchment:Usk, Catchment Boundaries, Wye
Class:Tump (400-499m)
(Tu,4)
Grid ref:SO 17887 30111
Summit feature:cairn
Drop:55m
Col:395m  SO180303  
OS map sheet(s):(1:50k) 161
(1:25k) OL13N
Observations:cairn is on ancient earthwork; natural summit not identifiable
Survey:obvious summit
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 97 users)ByDate of Ascent
Path from col to NE. Hill has ancient ring mound earthworks and more recent rectangular structure on summit. High point man-made, hard to say where natural high point might have been. Very wet and muddy track to Rhyd-y-car.RichardM05/11/2023
Lovely clear views at dusk. Impressive grassy ramparts and ditch. Remains of stone tower. Return to Brecon Bunkhouse.Denise 05/11/2023
Parked in lane to the north, bagged summit then onto Pen y GribAlan Caine04/11/2023
Parked in the small car park Pengenffordd  £2 honesty box followed the route named the Dragons Back > Castell Dinas > Pen y Grib > WAUN FACH (Trig pillar missing on Gwynydd Bach)Tony Hartry15/10/2023
Dragons Back Loop - 10m with Peggydavecnash12/07/2023
Revisit to Twmpa, Rhos Dirion, and Waun Fach, Mynydd Troed, while supervising two groups of GSAL Explorer Scouts doing their KSA Qualifying expedition from Gospel Pass to Llangors, along the Black Mountains. Also a sneak first bag of Castell Dinas, slightly off route. 23km with 880m ascent taking the groups 9h 20m.silveracorn_alan01/04/2023
As for Waun Fachisabelle19/02/2023
Steep sided hill with castle ruins permissive pathfreethehilltops26/10/2022
Figure 8 loop of Castell Dinas, Pen y Grib, Mynydd Llysiau & Pen Twyn Glaslboutside23/07/2022
Circular route of Mynydd Llysiau, Waun Fach, Pen y Grib then Castell Dinas.SootAndShale21/10/2021
Parked just short of Farm to north. Walked up cobbled and muddy lane before turning west and up permissive path. Impressive remains of fort with fabulous vantage point. Returned initially west and then took. Stiles fp back to car.Campbell Singer22/08/2021
En route to watch Jemma play rugby. Circuit route. Great views from top.Barbara Singer22/08/2021
12 mile walk from Waun Fach hamlet, walked across fields then along track following river all the way to Cwmfforest farm, on way we helped a sheep after it got its horn stuck in a fence. From Cwmfforest the path heading north east doesn't exist, it started quite promisingly with a stile but then the barbed wire fences were across the paths route so cut across to the road up to Rhyd-Y-Car, climbed up onto Pen.Y.Grib, then onto Castell Dinas, great views from both then descended west onto Mynydd Troeds slopes finding a contouring path up to the summit (2nd time bagged), from there walked along ridge to Mynydd Llangorse (2nd time bagged), up to the small pile of stones on summit, from there headed NE east and descended path (doesn't follow route shown on map) through Blaenau-Draw farm back to car. Afterwards drove to and bagged The Begwns. Perfect walking weather; sunny/windy and perfectly clear, could see for miles, saw about 20 people all day.DanTrig01/09/2019
Dragons Back ridge run with Paulinemilejunkie31/07/2019
Climbed this on a varied walk starting at the Pwll-y-Wrach waterfalls.roadbiker3228/05/2018
as per Adrianarranc27/05/2018
Fascinating hill fort summit with a more recent (but old) ruin. Access is good and it is the first top on the Y Grib ridge (apologies to Welsh for the tautology)- I guess the best way onto the Black Mountains. I continued to Waun Fach and returned to Pengenffordd via Pen Trumau, gravel/stone surfaced paths where there had been a wide, eroded peaty mess. I missed Castell Dinas in Jan 1991 when I did a similar walk over Waun Fach(qv)- was the issue access or light of day then?- I can't remember. Fine with just a 10 min shower today.pwheeler21/04/2018
Climbed with Kate, Ellie, Steve, and Loki from Dragon’s Back car park. Cold and windy day, couldn’t take Ellie further up the ridge. Beautiful spot.cdshear28/03/2018
Circular hike covering Castell Dinas - Bwlch Back a'r Grib - Pen y Grib - Grwyne Fawr Reservoir - Pen y Manllwyn - Pen y Grib - Bwlch Bach A'r Grib - Blaenau-Uchaf - Dinas - Pengenffordd. Parking: Pengenfford pub car park.manilena28/10/2017
Parked at the Dragon's Back car park (£2 for charity). Castell Dinas, Pen Y Grib and then on to Twyn Tal Y Cefn via Rhos Y Dirion. 10 miles.clivevilla16/11/2016
Parked in at end of RED Head lane at Pengenffordd (by house Dinas) - ascended via the Dragons Tale ( Bwlch Bach ar Grib - Pen-y-Grib - Pen-y-Manilwyn - Waun Fach - Pen-y-Gadair Fawr - Waun Fach - Pen Trumau - Rhiw trumau - Rhyd-y-Car - Castell Dinas (Ironage fort & Norman Castle remains)briandavies08/10/2016
Ample parking just before Dinas farm.Adrian27/08/2016
Parked in lane at Pengenfford and followed farm track.Ramblingpaul14/08/2016
dragons back pub cp, castell dinas, peny crib, rhos dirion, twmpa, twyn tal cefn, chwarel y fan, bal mawr tp, peny gadiar fawr, waun fach and back down y crib good day views and relatively quiet for bank holidayunderhill30/05/2016
On a JJ trip staying at The Dragon's Back bunkhouse, onwards then ending up in Crickhowell.Lou30/04/2016
On the way to Waun Fach etc from Pengenffordd.clyoung05/04/2016
Good final climb after a great day out, we climbed upm from the farm at Rhyd-y-Car after a long descent from Mynydd LlysiauDanMaisieBex14/02/2016
Visited on way back from Waun Fach and Pen y GribNumb28/10/2015
Killy training walk, clear at the car park. Climbed in to the cloud and some rain. A few views on offer on the way down.aussie196103/05/2015
With Swiftyfosbury200525/04/2015
Part of climb that included Castle Dinas, Pen Y Grib, Y Grib, Bwlch a'r Grib, Cwm Y Nant, Pen Y Manllwyn, Waun Fach. Twyntal Y CefnFergalh22/01/2015
Walking Group walk. Number one of five summits on this walk. Cloudy, fog on summits, very windy and isolated showers. Castell Dinas, The Dragons Back (Y Grib), Pen y Manllwyn, Waun Fach, Pen y Gadair Fawr, Mynydd Llysiau. Food at Nantyffin Cider Mill Inn afterwards. Distance = 20.14km. Average moving speed = 4.2km/h. Time moving = 4:50. Ascent = 1423m.paulnewby8111/05/2014
SO17887 30112Anton01/09/2012
Ascended following decent from Y Grib.Peapod2114/04/2012
446m (3m). Ruined stonework, W cairn higher. nice accessible summits: routes on openStreeMap; parking RHW02/04/2011
Visited en-route to Waun Fach.jonglew16/12/2007
2 day horseshoe from Abergavennyrbayfield12/09/2004
Ascended after descending from Mynydd Troed.JohnW10/07/2003
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