4.5
(4)
1,023
runners
48
runs
Jogging around Llyn Trawsfynydd offers routes through Snowdonia National Park, characterized by the large artificial reservoir and its surrounding natural features. The area provides an established network of footpaths and cycleways, including a multi-terrain path that circles the lake. This landscape features woodlands, nature reserves, and gently undulating sections, with the lake reflecting the surrounding mountains. The terrain includes a mix of tarmac, gravel paths, and grass, making it suitable for various running preferences.
Last updated: April 25, 2026
124
runners
12.9km
01:27
150m
150m
Moderate run. Good fitness required. Mostly accessible paths. Some sure footedness required.
8
runners
5.71km
00:36
70m
70m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Sign up for free
5
runners
5.40km
00:35
60m
60m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
6
runners
9.64km
01:02
150m
150m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
9
runners
7.39km
00:48
90m
90m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
Prysor Cafe now open most days, nice seating outside overlooking llyn.
0
0
This footbridge was built to replace some of the lost footpaths that the lake flooded. The old track here linked Trawsfynydd village with the old chapel. It's a metal lattice construction with a wooden deck. When you run around the lake it's a nice change of surface.
1
0
Maentwrog Dam was built in the 1920s to provide a source of hydroelectric power. Later in 1965 the lake also became a source of cooling water for the nuclear power station.
1
0
Trawsfynydd nuclear power station was the only inland nuclear power plant in the UK. It was able to be situated here because of the large lake that provided sufficient cooling water to the reactors. The power station switched on in 1965 and closed at the end of its safe life in 1991. The planned decommissioning was expected to take about 100 years but in 2021 the Welsh government started to explore plans to install a smaller reactor and reinstate the power station to help Wales reach zero carbon electricity production.
0
0
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.
2
0
The routes around Llyn Trawsfynydd offer a varied multi-terrain experience. You'll find a mix of tarmac, gravel paths, and grass sections. While generally flat, some routes include gently undulating sections and an initial ascent near the dam, providing a diverse and engaging run. Many paths follow dedicated cycle tracks, ensuring a relatively smooth surface.
Yes, Llyn Trawsfynydd offers options suitable for beginners. While many routes are moderate, there are at least 2 easy routes available. These trails provide a gentle introduction to running in the area, allowing you to enjoy the scenery without significant challenge.
Runners are treated to breathtaking scenery with the lake reflecting the surrounding Snowdonia mountains. You'll pass through woodlands, nature reserves, and wetlands. A notable feature is the footbridge spanning a narrow part of the lake, offering unique views. Keep an eye out for diverse birdlife, including ospreys, and other wildlife like otters.
Yes, the area is well-known for its circular routes. A significant draw is the multi-terrain path that circles the lake itself, offering approximately an 8-mile (13.8 km) loop. For a shorter option, consider the Running loop from Maentwrog, which is a moderate 3.5 miles (5.7 km) path.
Beyond the natural beauty, you can encounter several points of interest. The lake itself is a large artificial reservoir, and you might spot the former Trawsfynydd Nuclear Power Station. The Maentwrog Dam is also a prominent feature. For history enthusiasts, the Roman Hill fort of Tomen y Mur is part of a nearby hike.
The established network of footpaths and cycleways, particularly the dedicated cycle track around the lake, makes many sections suitable for families. The varied terrain and relatively flat sections offer a pleasant experience for different fitness levels, including those running with children.
Generally, the footpaths and cycleways around Llyn Trawsfynydd are dog-friendly. However, as the area is within Snowdonia National Park and features nature reserves, it's always best to keep dogs under control, especially near livestock or wildlife, and to check for any specific local signage regarding dog access.
The running routes in Llyn Trawsfynydd are highly rated by the komoot community, with an average score of 4.5 stars from over 4 reviews. Runners often praise the stunning views of the lake and mountains, the varied multi-terrain paths, and the sense of freedom offered by the well-maintained trails.
Yes, there is a visitor centre with a café available in the area, which can be a convenient spot for a post-run refreshment or to gather more information about the region.
A popular moderate route is the Maentwrog Dam – View of Llyn Trawsfynydd loop from Maentwrog. This 6.0 miles (9.6 km) trail leads through the area around the Maentwrog Dam and can typically be completed in about 1 hour 2 minutes, offering engaging gradients and scenic views.
The full loop around Llyn Trawsfynydd, known as Around Llyn Trawsfynydd — Snowdonia National Park, is approximately 8.0 miles (12.9 km) long. It typically takes about 1 hour 27 minutes to complete this multi-terrain loop, depending on your pace.
Absolutely. For a shorter run, you could try the Llyn Trawsfynydd – View of Llyn Trawsfynydd loop from Maentwrog. This route is about 3.7 miles (5.9 km) and offers beautiful views of the lake, making it a great option for a quicker outing.


Browse the best Running Trails & Routes in other regions.