4.8
(82)
7,752
runners
217
runs
Jogging routes around Llyn Cwellyn explore a landscape shaped by glacial activity, featuring a deep lake set against the backdrop of the Snowdon Massif and Mynydd Mawr. The region includes varied terrain, from valley paths along the Afon Gwyrfai river to ascents into the surrounding mountains. Woodlands and forests, such as parts of Beddgelert Forest, add further diversity to the running environment.
Last updated: April 25, 2026
76
runners
Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required.
9
runners
8.25km
01:19
540m
540m
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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8
runners
8.40km
01:20
510m
510m
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
5
runners
15.4km
02:09
670m
670m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
68
runners
21.7km
03:20
1,250m
1,250m
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
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Best summit shelter ever! Seating supplied, some with side tables.🙂👍
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I think the start and the end is probably the hardest but overall pretty easy path you can’t get lost
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Great view of the lake and the climb to come , stopped for a quick brew before the ascent up
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Komoot auto routed through here and I happened to encounter the farmer/landowner who was politely irritated we'd gone through private fields where there's no legal access.
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The running routes around Llyn Cwellyn offer a diverse range of terrain. You'll find paths through glacial valleys, alongside the Afon Gwyrfai river, and through woodlands like parts of Beddgelert Forest. The area is also flanked by the impressive Snowdon Massif and Mynydd Mawr, providing mountainous backdrops and opportunities for challenging ascents.
Yes, Llyn Cwellyn offers options for easier runs. The Lôn Gwyrfai, for example, is a multi-use recreational path stretching 4.5 miles (7 km) between Rhyd Ddu and Beddgelert, graded as an 'easy leisure route' perfect for a less strenuous jog. Komoot lists 8 easy routes in the area, often on mostly paved surfaces.
For experienced runners seeking a challenge, Llyn Cwellyn has plenty to offer. Routes like the Bwlch Glas Finger Stone – Yr Wyddfa (Snowdon) Summit loop from Snowdon Ranger, an 8.1-mile trail with significant elevation gain, provide demanding climbs towards Snowdon's summit. Another difficult option is the Mynydd Mawr – Craig Cwmbychan loop from Rhyd-ddu, which features panoramic views and substantial elevation changes. The Snowdon Ranger Path itself, starting near the lake, is also considered a challenging trail run with steep sections.
Yes, many of the running routes in the Llyn Cwellyn area are circular, allowing you to start and finish at the same point. Examples include the Descent from Foel Goch loop from Snowdon Ranger and the Mynydd Mawr – Craig Cwmbychan loop from Rhyd-ddu. These loops offer varied mountain landscapes and stunning views.
For families, the Lôn Gwyrfai path is an excellent choice. It's a relatively easy and well-maintained multi-use path that offers a pleasant experience for all ages. Its gentle gradients and scenic views make it suitable for a family jog or walk, connecting the villages of Rhyd Ddu and Beddgelert.
Jogging around Llyn Cwellyn offers stunning natural sights. You'll be surrounded by the Snowdon Massif and Mynydd Mawr, with views extending to the Nantlle Ridge and Moel Hebog. The lake itself is a deep glacial reservoir, and you might spot Castell Cidwm (Wolf Castle), a striking natural rock formation at its northern end. The Afon Gwyrfai river and sections of Beddgelert Forest also add to the picturesque scenery.
Yes, Llyn Cwellyn and its surrounding trails are generally dog-friendly. Many paths, including sections of the Lôn Gwyrfai, are suitable for running with dogs. However, always ensure your dog is under control, especially in areas with livestock, and be mindful of local signage regarding lead requirements within Snowdonia National Park.
The running routes in Llyn Cwellyn are highly regarded by the komoot community, with an average score of 4.8 stars from over 80 reviews. Runners often praise the diverse terrain, from valley paths to challenging mountain ascents, and the breathtaking views of the Snowdon Massif and surrounding landscapes. Over 8,000 runners have already explored the area using komoot.
Yes, public transport can help you access the trails. The Welsh Highland Railway runs alongside the lake, offering a unique way to reach certain points. Additionally, the village of Rhyd Ddu, located at the southern end of the lake, serves as a convenient starting point for many paths and trails and is accessible by local bus services. Check local transport schedules for specific routes and times.
Parking is available at various points around Llyn Cwellyn. The village of Rhyd Ddu, a common starting point for many trails, typically has parking facilities. There are also parking areas near the Snowdon Ranger Path trailhead. It's advisable to arrive early during peak seasons as spaces can fill up quickly, especially for popular routes.
Llyn Cwellyn is home to diverse wildlife. The lake itself is known for its natural population of Arctic char and brown trout. You might also spot otters in and around the water. The surrounding woodlands and river areas support various bird species and other small mammals, making for an engaging experience while you run.
The small village of Rhyd Ddu, situated at the southern end of Llyn Cwellyn, offers some amenities, including potential cafes or pubs where you can refuel after your run. Given its location within Snowdonia National Park, other villages and towns nearby will also have options for refreshments.


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