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Running trails & routes

Llyn Trawsfynydd – View of Llyn Trawsfynydd loop from Maentwrog

Running trails & routes

Llyn Trawsfynydd – View of Llyn Trawsfynydd loop from Maentwrog

Moderate

10

runners

Llyn Trawsfynydd – View of Llyn Trawsfynydd loop from Maentwrog

01:02

9.64km

150m

Running

Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 21, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Parc Cenedlaethol Eryri

Waypoints

A

Start point

Parking

Get Directions

1

341 m

Llyn Trawsfynydd Visitor Centre

Highlight • Cafe

Cafe/restaurant and fishing centre at the lake. Open Thurs-Sun 8-2:30

Tip by

2

727 m

Trawsfynydd Nuclear Power Station

Highlight • Monument

Here you can learn that the nuclear power plant is no longer in operation, serves as a (temporary) storage facility and should be dismantled by the end of the century.

Translated by Google •

Tip by

3

954 m

Llyn Trawsfynydd

Highlight • Structure

An enormous man-made reservoir, Llyn Trawsfynydd originally provided cooling water for the local nuclear power station (now undergoing decommissioning). The lake lies in the west of Snowdonia National Park and is overlooked by several mountains. While a lake with a nuclear power station on its banks might not sound like a wondrous place, Llyn Trawsfynydd is actually exceptionally beautiful.

Cycleways and footpaths have been created around the lakeshore and are well-maintained. With woodlands, nature reserves and wetlands, there’s a lot of animal and birdlife here, as well as Atlantic oakwoods. You can cycle the entire way around the lake thanks to a new trail and National Cycle Route 82 leads you from the north around the eastern side.

Tip by

4

2.97 km

Maentwrog Dam

Highlight • Lake

Maentwrog Dam was built in the 1920s to provide a source of hydroelectric power for the Maentwrog power station. Later in 1965 the lake also became a source of cooling water for the Trawsyfynydd nuclear power station.

Tip by

5

4.87 km

View of Llyn Trawsfynydd

Highlight • Lake

Surprisingly steep uphill to here, but good views and the high point of the circuit around the Llyn.

Tip by

6

8.95 km

View of Llyn Trawsfynydd

Highlight • Viewpoint

Beautiful views across the lake and the mountains beyond. Originally a reservoir built for the nuclear power station nearby.

Tip by

B

9.64 km

End point

Parking

Way Types & Surfaces

Way Types

4.73 km

3.99 km

371 m

299 m

184 m

Surfaces

4.84 km

3.88 km

359 m

184 m

139 m

< 100 m

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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 (290 m)

Lowest point (190 m)

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Weather

Powered by Foreca

Tuesday 25 August

23°C

13°C

65 %

Additional weather tips

Max wind speed: 11.0 km/h

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