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Running trails & routes

United Kingdom

Wales

South Wales

Llanfihangel Cwmdu With Bwlch And Cathedine

Talybont Reservoir – View of Talybont Reservoir loop from Bwlch

Routes

Running trails & routes

United Kingdom

Wales

South Wales

Llanfihangel Cwmdu With Bwlch And Cathedine

Talybont Reservoir – View of Talybont Reservoir loop from Bwlch

Hard

runners

Talybont Reservoir – View of Talybont Reservoir loop from Bwlch

04:36

37.2km

1,340m

Running

Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: May 10, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Bus stop

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7.92 km

Talybont Reservoir Dam

Highlight • Lake

Built in the 1930s to supply water to the Newport region, Talybont Reservoir's surroundings are a glorious place to explore in your running shoes. You can run right across the dam here on your way towards the Central Beacons massif. The forest trails on both sides of the reservoir make for some tough ascents but thrilling descents.

Tip by

8.25 km

Talybont Reservoir

Highlight • Structure

The largest reservoir in the Brecons, Talybont reservoir was completed in 1939. It supplies water to Newport, further south.

Seventeen dwellings (including farms) were co-opted during its construction.

Despite its man-made nature, it's a very pleasant place to spend some time.

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17.8 km

Blaen-y-Glyn Waterfalls

Highlight • Natural Monument

The Blaen-y-Glyn waterfalls are a number of beautiful cascades where the Nant Bwrefwr and the infant Afon Caerfanell spill from the eastern end of the Central Beacons massif. Although beautiful, the gradients here are steep, so exploring the tumbling streams can be strenuous.

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18.7 km

Torpantau Railway Tunnel

Highlight • Structure

Torpantau Tunnel is a closed-down, 666-yard-long abandoned masonry railway tunnel in Wales that was opened in 1863 and closed down in 1963. It was part of the Brecon and Merthyr Railway line and, at 1,313 feet above sea level, was the highest tunnel on the UK railway network. Now it is disused but is often used as part of team building and adventure walks by local activity providers. If you are thinking of using it, you will need wellingtons (which will just about keep you dry) and a head torch. It is a brilliant place to lead a group of kids through and jump out to scare them half to death.

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20.3 km

Taf Fechan Forest

Forest

20.9 km

Pentwyn Reservoir

Lake

21.9 km

Pentwyn Reservoir

Highlight • Lake

Pentwyn Reservoir is the smaller sister to Pontsticill Reservoir, both being separated by a causeway going towards the old Dolygaer outdoor centre. It is a very popular spot with fishermen and outdoor enthusiasts alike. The reservoir is used daily for a mix of watersports such as paddle boarding, kayaking, canoeing and raft building. It is in a beautiful setting, and you have great views north towards Pen y Fan and nice walks nearby.

Tip by

26.6 km