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Hiking trails & Routes

Rhondda Cynon Taf

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

Hiking trails & Routes

Rhondda Cynon Taf

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

Hard

3.0

(1)

20

hikers

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

06:06

21.0km

550m

Hiking

Hard hike. Very good fitness required. Easily walkable paths. The starting point of the route is accessible with public transport.

Last updated: August 6, 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 1.13 km for 27 m

Waypoints

A

Start point

Bus stop

1

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

2

630 m

Llwyn-on Reservoir Dam Tower

Highlight • Viewpoint

Amazing views especially at night with a bright torch

Tip by

1.15 km

Beach

Beach

4

10.2 km

Twyn Mwyalchod Trig Point

Highlight • Natural Monument

At 644 metres, Twyn Mwyalchod is another local and pretty accessible trig point. It can either be a reasonable short up-and-down hike, though a steep one, or you can make …

Tip by

5

18.5 km

View of the Brecon Beacons

Highlight • Trail

This is an absolutely stunning walk just at the skirt of Llyn onn Merthyr Tydfil

Translated by Google •

Tip by

B

21.0 km

End point

Bus stop

Way Types & Surfaces

Way Types

12.3 km

7.57 km

808 m

246 m

116 m

Surfaces

14.4 km

4.54 km

1.19 km

468 m

457 m

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Elevation

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

Highest point (630 m)

Lowest point (260 m)

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Weather

Powered by Foreca

Today

Wednesday 28 October

12°C

7°C

56 %

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

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