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Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

Routes

Bike touring routes & trails

Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

Moderate

4.4

(5)

riders

Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

01:16

20.0km

230m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: February 24, 2026

Tips

Includes segments that go up or down a series of steps

You may need to carry your bike.

After 110 m for 17 m

After 19.9 km for 17 m

Waypoints

Start point

Train Station

Get Directions

3.50 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

6.22 km

Pontsarn Viaduct

Highlight • Historical Site

Good ride

Tip by

6.31 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

7.68 km

Taf Trail

Highlight • Cycleway

The full route provides a fantastic mix of terrain and scenery😊

Tip by

9.99 km

Pontsticill Reservoir

Highlight • Structure

Pontsticill Reservoir is a great location for its scenic beauty and because it is the start of many hiking and biking trails. There is a nice trail that actually goes …

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10.1 km

Pontsticill Reservoir Dam and Tower

Highlight • Structure

This reservoir is located in the breathtaking Brecon Beacons of Wales. It is part of a series of reservoirs within the Taff Fechan Valley and was constructed between 1923 and …

Tip by

11.8 km

Merthyr Tydfil Cycle Path

Highlight (Segment) • Trail

A beautiful cycle path between Merthyr and Pontsticill Reservoir. The very start of the track at the Merthyr end is narrow and steep (you need to watch out for pedestrians), …

Tip by

20.0 km

End point

Train Station

Way Types & Surfaces

Way Types

15.5 km

3.60 km

531 m

180 m

156 m

< 100 m

Surfaces

19.3 km

645 m

< 100 m

Elevation

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

Highest point (330 m)

Lowest point (170 m)

Weather

Tuesday 5 May

12°C

6°C

11 %

Additional weather tips

Max wind speed: 5.0 km/h

to get more detailed weather forecasts along your route

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

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Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

Cefn-coed Viaduct

Pontsarn Viaduct

Pontsarn Viaduct

Taf Trail

Pontsticill Reservoir

Pontsticill Reservoir Dam and Tower

Merthyr Tydfil Cycle Path

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