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Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Llwyn-onn

Routes

Running trails & routes

Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Llwyn-onn

Hard

runners

Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Llwyn-onn

01:55

17.2km

270m

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 27, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Bus stop

Get Directions

373 m

Llwyn-on Reservoir Dam Tower

Highlight • Viewpoint

Amazing views especially at night with a bright torch

Tip by

459 m

Garwnant Forest and Lake

Highlight • Forest

502 m

Llwyn-on Reservoir Dam

Highlight • Structure

Llwyn-on reservoir, built in 1926, covers 150 acres and is the largest of the three in the Taff Fawr Valleys area. Walking along the shore you can be immersed in …

Tip by

677 m

Llwyn Onn Reservoir

Highlight • Structure

Smaller reservoir than others in the area, but with stunning landscape great off road paths to keep you away from the A470

Tip by

8.14 km

View of Llwyn-on Reservoir from the west bank

Highlight • Lake

Look out for the opening in the hedge row, some gentle steps (3-4) and then a short trail to the water. Can easily walk your bike down, kick back and have some drink and recharge

Tip by

11.3 km

Garwnant Reservoir and Dam

Highlight • Lake

11.5 km

Garwnant Visitor Centre

Highlight • Rest Area

Brecon Beacons visitor centre with plenty of parking, a children’s play area, cafe.

Tip by

16.1 km

Llwyn-on Reservoir

Highlight • Forest

Zoe has given out a lot of the history of the dam. Let's just add a bit of local information to say that this is a hidden gem of a …

Tip by

16.4 km

Beach

17.2 km

End point

Bus stop

Way Types & Surfaces

Way Types

6.81 km

4.50 km

2.12 km

1.72 km

1.52 km

454 m

< 100 m

Surfaces

5.60 km

3.40 km

3.36 km

2.17 km

2.05 km

637 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (380 m)

Lowest point (260 m)

Weather

Today

Monday 13 July

26°C

11°C

0 %

Additional weather tips

Max wind speed: 19.0 km/h

to get more detailed weather forecasts along your route

Comments

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Llwyn-onn

Llwyn-on Reservoir Dam Tower

Garwnant Forest and Lake

Llwyn-on Reservoir Dam

Llwyn Onn Reservoir

View of Llwyn-on Reservoir from the west bank

Garwnant Reservoir and Dam

Garwnant Visitor Centre

Llwyn-on Reservoir

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