GPS Cycle and Walking Routes

Llwyn-on Reservoir

3 miles (5 km)

This circular walk takes you around the lovely Llwyn-on Reservoir on the edge of the Brecon Beacons. It's about a 3 mile walk around the lake so should take about an hour.
You can start the walk at the south eastern end of the water where there is some lay by parking. From here you can pick up the Taff Trail and follow it along the western side of the reservoir. This takes you towards the Coed Taf Fawr where you can cross the river on a bridge at the northern end. You can then follow another footpath south along the eastern side of the reservoir.
The lake attracts various water loving birds which you can look out for from the bird hide. Also look out for the environmental sculptures whichcan be found on the Wern and Willow walks.


CF48 2HS - Please note: Postcode may be approximate for some rural locations

Llwyn-on Reservoir OS Map - Mobile GPS OS Map with Location tracking

Llwyn-on Reservoir Open Street Map - Mobile GPS Map with Location tracking


On the walk you'll skirt the edge of the Garwnant Forest. Here there's a very good visitor centre and a cafe where you could enjoy some refreshments on the route. There's also another car park here so the forest makes and alternative start point for the walk.

Further Information and Other Local Ideas

Just to the north is Nant Ddu where there's a pleasant trail along a pretty stream with waterfalls and more nice views. Near here there's more waterside trails around Cantref Reservoir.
Head due east from the reservoir and you will soon come to Pontsticill Reservoir and Pentwyn Reservoir. Near here there's also some fine woodland trails in the Taf Fechan Forest and more waterside walks along the Upper and Lower Neuadd Reservoirs.
You could also head into Merthyr Tydfil to enjoy walks along the River Taff and visit the Grade I listed Cyfarthfa Castle and gardens.


Entrance to lay-by, Llwyn-onn reservoir - - 1744423

Entrance to parking lay-by at the reservoir

Llwyn-on Reservoir - - 148765

The reservoir, the third and largest of three reservoirs in the Brecon Beasons, covers an area of 150 acres in the Taff valley.

The dam, Llwyn-onn reservoir - - 1744019

The dam, Llwyn-onn reservoir

Woodland picnic area beside the Llwyn-onn reservoir - - 1744416

Woodland picnic area beside the Llwyn-onn reservoir


GPS Files

GPX File

Llwyn-on Reservoir.gpx (On Desktop:Right Click>Save As. On Ipad/Iphone:Click and hold>Download Linked File)

Memory Map Route

Llwyn-on Reservoir.mmo (On Desktop:Right Click>Save As. On Ipad/Iphone:Click and hold >Download Linked File)