GPS Cycle and Walking Routes

Grwyne Fawr Reservoir

5 miles (8 km)

This is a lovely waterside walk along the Grwyne Fawr to Grwyne Fawr Reservoir in the Brecon Beacons. You can start your walk from the Mynydd Du car park and follow the trails north to the reservoir. The rushing waters and the beautiful scenery of the Vale of Grwyney are a real delight. The route climbs to a height of over 1800ft so is quite challenging. You are rewarded with splendid views over the surrounding hillls of the Black Mountains.
To extend your walk you could further explore the Mynydd Du Forest with its miles of walking trails and mountain bike tracks to try. Just to the west of the lake you can pick up the Dragons Back circular walk which provides magnificent views over the area. Also nearby is Waun Fach the highest mountain in the Black Mountains. The climb to Mynydd Troed and Cockit Hill from Pengenffordd is also located in this area.


NP7 7LY - Please note: Postcode may be approximate for some rural locations

Grwyne Fawr Reservoir OS Map - Mobile GPS OS Map with Location tracking

Grwyne Fawr Reservoir Open Street Map - Mobile GPS Map with Location tracking


Just to the east you will find the noteworthy Llanthony Priory Hotel. This includes a small country inn, often known as the "Abbey Hotel", which sits within the original 12th centuryAugustinian priory. They have a good menu and a cosy interior witha vaulted ceiling and open log fire. You can find it at a postcode of NP7 7NN.

Further Information and Other Local Ideas

You can pick up the Llanthony Priory Circular Walk near the hotel mentioned above and explore the historic Augustinianpriory. The picturesque ruins are now under the care ofCadwand entrance is free to the public.
The epic Cambrian Way passes the lake. The long distance waymarked route starts from the city of Cardiff and runs for nearly 300 miles through the Brecon Beacons, the Cambrian Mountains and Snowdonia before finishing on the North Wales coast at Conwy.
For more walking ideas in the area see the Brecon Beacons Walk page.


Grwyne Fawr reservoir dam (geograph 3590130)

Grwyne Fawr reservoir dam

Grwyne Fawr Reservoir - - 1753353

Reservoir viewed from the moorland above

Above Grwyne Fawr reservoir - - 704339

Looking down from the north-eastern corner of the square on the Twyn Talcefyn ridge. Up here its all tussocky moorland grass.

Grwyne Fawr Reservoir dam - - 135959

Below the snowy NE flanks of Waun Fach, the reservoir is completely full: water is emerging through the spillway arches and running down the dam face.

GPS Files

GPX File

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

Memory Map Route

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