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Routes
Hiking trails & Routes
United Kingdom
Wales
South Wales
Merthyr Tydfil

Pontsarn Viaduct – Pontsarn Viaduct loop from Merthyr Tydfil

Routes
Hiking trails & Routes
United Kingdom
Wales
South Wales
Merthyr Tydfil

Pontsarn Viaduct – Pontsarn Viaduct loop from Merthyr Tydfil

Moderate

4.2

(5)

34

hikers

Pontsarn Viaduct – Pontsarn Viaduct loop from Merthyr Tydfil

03:40

13.6km

180m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: March 4, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Bannau Brycheiniog National Park

Cwm Taf Fechan Woodlands Site of Special Scientific Interest

Waypoints

A

Start point

Train Station

Get Directions

1

1.37 km

Lake with Lily Pads

Highlight • Natural

2

2.05 km

Merthyr Ironworks Ruins

Highlight • Historical Site

Not much left of the old iron works. With a bit of time, experience and phantasy you can roughly reconstruct the old site, but without knowing the history you could as well overlook these ruins.

Tip by

3

3.53 km

Cefn-coed Viaduct

Highlight • Monument

The Cefn-coed Viaduct is the third-largest viaduct in Wales. This huge, curved structure once carried the Brecon and Merthyr Tydfil Junction Railway and is now part of the Taff Trail, …

Tip by

4

6.25 km

Pontsarn Viaduct

Highlight • Historical Site

Good ride

Tip by

5

6.34 km

Pontsarn Viaduct

Highlight • Monument

Pontsarn Viaduct was built in the 1860s to carry the Brecon and Merthyr Railway over the Taf Fechan river. The viaduct has seven arches and is situated in a very picturesque landscape.

Tip by

6.98 km

Cwm Taf Fechan

Forest

7

7.30 km

Morlais Quarry

Highlight • Natural

The disused Morlais Quarry is a popular climbing venue with outdoor pursuit groups, the Quarry can be accessed from the Taf Fechan trail which runs along the disused trackbed.
Description …

Tip by

8

8.13 km

Pontsarn Blue Pool

Highlight • Natural

Blue Pool.
At the bridge, head downstream on the right bank, following the path, to reach the Pontsarn Blue Pool. The path can be followed as far as desired beyond …

Tip by

9.31 km

Cwm Taf Fechan Nature Reserve

Nature Reserve

10

10.5 km

Lido on the Taff Trail

Highlight • River

B

13.6 km

End point

Train Station

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Way Types & Surfaces

Way Types

7.84 km

3.96 km

714 m

569 m

454 m

Surfaces

5.44 km

2.58 km

2.55 km

1.46 km

1.42 km

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Elevation

Elevation

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

Highest point (320 m)

Lowest point (170 m)

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Weather

Powered by Foreca

Friday 15 May

11°C

3°C

-- %

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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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