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Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

Moderate

3.0

(2)

riders

Pontsarn Viaduct – Pontsticill Reservoir loop from Merthyr Tydfil

02:27

43.1km

500m

Road cycling

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is accessible with public transport.

Last updated: March 4, 2026

Tips

Includes a segment in which cycling is not permitted

After 18.9 km for 241 m

Waypoints

Start point

Train Station

Get Directions

3.57 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, which is Route 8 of the National Cycle Network that runs between Cardiff and Brecon. It offers walkers and cyclists a superb view of the Taf Fawr as it cascades over the many weirs in the valley

Tip by

6.29 km

Pontsarn Viaduct

Highlight • Historical Site

Good ride

Tip by

10.1 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 around the entire reservoir, but it does involve road walking too. When you do visit this location, beware of thefts from unattended vehicles and take valuables with you.

Tip by

11.7 km

West Shore Road, Pontsticill Reservoir

Highlight (Segment) • Trail

If you're not equipped for the gravel track on the East shore of Pontsticill Reservoir, the road on the West shore offers a fun tarmac alternative. A nice long straight to crank out some speed, or if it's the views you're after a nice viewpoint from the lay-by.

Tip by

12.6 km

View of the Lake in Bannau Brycheiniog National Park

Highlight • Lake

14.5 km

Pentwyn Reservoir

Lake

15.1 km

Taf Fechan Forest

Forest

15.7 km

Middle of Bannau Brycheiniog National Park

Highlight • Natural

cute little transfer between the valley sides, watch out for the absolute walls on either side though.

Tip by

19.0 km

Lower Neuadd Reservoir

Highlight • Structure

Neuadd Valley, Brecon Beacons Horseshoe Ridge.
A challenging upland mountain walk that takes you into the heart of the Brecon Beacons. This includes some steep climbs and a flat ridge. You will find you may be walking on some made and some unmade footpaths. You'll be rewarded with spectacular views if the weather is good. Please be prepared for unpredictable mountain weather.
What Essentials You Need:
• Good Sturdy Boots
• Windproof Outer Jacket
• Gloves
• Waterproofs
• Map
• Compass
• Torch
• 1st Aid Kit
• A Whistle.
all of which is listed above is and will be essentially needed at some point throughout this walk, as the weather is very changeable and the system can change in just minutes in these mountains.

Difficulty:- Challenging
Time:- 5 hours - 6 hours
Distance:- 10 miles (16 km)

Tip by

25.0 km

Pontsticill Lake Canoe Launch

Highlight • Rest Area

This jetty on Pintsticill’s west side is used as a launching point for kayakers and canoers.

Tip by

43.1 km

End point

Train Station

Way Types & Surfaces

Way Types

21.4 km

16.6 km

2.54 km

1.98 km

370 m

244 m

< 100 m

Surfaces

35.8 km

5.47 km

1.77 km

< 100 m

Elevation

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

Highest point (430 m)

Lowest point (170 m)

Weather

Tuesday 19 May

15°C

9°C

56 %

Additional weather tips

Max wind speed: 30.0 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

Pontsticill Reservoir

West Shore Road, Pontsticill Reservoir

View of the Lake in Bannau Brycheiniog National Park

Middle of Bannau Brycheiniog National Park

Lower Neuadd Reservoir

Pontsticill Lake Canoe Launch

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