Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Forest Visitor Centre

Hiking trails & Routes

Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Forest Visitor Centre

Moderate

4.6

(17)

hikers

Llwyn-on Reservoir Dam – Llwyn-on Reservoir loop from Forest Visitor Centre

02:22

8.63km

140m

Hiking

Moderate hike. Good fitness required. Easily walkable paths. The starting point of the route is accessible with public transport.

Last updated: September 16, 2026

Tips

Includes a short out-and-back section

Your route doubles back at a waypoint. If this isn’t intentional, adjust the waypoint’s position.

After 432 m for 87 m

Waypoints

Start point

Bus stop

Get Directions

475 m

Garwnant Visitor Centre

Highlight • Rest Area

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

Tip by

745 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

6.08 km

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

6.12 km

Llwyn-on Reservoir Dam Tower

Highlight • Viewpoint

Amazing views especially at night with a bright torch

Tip by

6.72 km

Beach

7.11 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

8.63 km

End point

Bus stop

Way Types & Surfaces

Way Types

4.94 km

2.64 km

776 m

249 m

< 100 m

Surfaces

3.14 km

2.23 km

2.21 km

410 m

400 m

249 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

Wednesday 28 October

13°C

7°C

61 %

Additional weather tips

There’s a fairly high chance of rain. Consider packing a waterproof jacket.

to get more detailed weather forecasts along your route

Comments

March 3, 2024,Garwnant & Llwyn Onn Reservoir loop — Bannau Brycheiniog (Brecon Beacons) National Park

A lovely dry day for a change and a walk out and about around Garwnant Visitor Centre and Llwyn Oon Reservoir. A lovely all-round walk linking up a variety of their trails. It has been a while since I have been here, so nice to see such nice modern facilities on your doorstep.