4.5
(33)
2,834
runners
122
runs
Jogging routes around Llyn Dulyn traverse the remote Carneddau mountain range in Snowdonia, North Wales. The region is characterized by dark waters surrounded by high, steep cliffs and rugged mountain terrain, offering a sense of wild remoteness. Trails lead past remote reservoirs and through valleys, with the imposing Carneddau crags always in view. This area provides a diverse network of paths for various fitness levels, from moderate lakeside runs to more strenuous mountain ascents.
Last updated: June 24, 2026
4
runners
9.13km
01:04
300m
300m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
runners
16.9km
02:31
940m
940m
Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required.

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35
runners
18.0km
02:50
790m
790m
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
25
runners
30.9km
05:20
1,760m
1,760m
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
10
runners
11.8km
01:32
580m
580m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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A very fine mountain that is the high point of the Carneddau range. These mountains are high, remote and so much quieter than the Glyderau or Snowdon. Fabulous walking country.
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Carnedd Llewelyn is high and relatively remote, so walks there are quite a serious undertaking.
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Moel Siabod is a terrific viewpoint as it is isolated from the other main peaks of Eryri. On the day I climbed it I was fortunate to experience an inversion, where the clouds form a layer below the summit.
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There are over 100 dedicated running routes in the Llyn Dulyn area, offering a wide range of options for different fitness levels. You'll find everything from moderate lakeside paths to challenging mountain ascents.
The Llyn Dulyn area is characterized by its dramatic, rugged mountain scenery within the Carneddau range. You'll experience dark, brooding lake waters surrounded by high, steep cliffs, remote reservoirs, and open moorland. The sense of wild remoteness and the chance to spot distinctive Carneddau Ponies make for a truly inspiring run.
Yes, while many routes are challenging, there are around 10 easier trails suitable for beginners or those looking for a less strenuous run. These often include moderate lakeside walks with clear paths, allowing you to enjoy the scenery without significant elevation gain.
For experienced runners seeking a challenge, the region offers many difficult routes. Examples include the Pen Yr Ole Wen – Carnedd Llewelyn loop from Capel Curig, a 21.4-mile trail with extensive mountain views, or the Llyn Mymbyr – Moel Siabod summit loop from Capel Curig, which features significant elevation gain and panoramic vistas.
Yes, the area is well-suited for circular runs. Popular options include the Yellow Lake – Dulyn Reservoir loop, a moderate 5.8-mile trail, and other circular walks that allow you to explore the stunning landscapes without retracing your steps. Many of komoot's routes are designed as loops for convenience.
You'll encounter several striking natural features. The dark waters of Llyn Dulyn itself are a highlight, surrounded by high cliffs. Trails often pass by remote reservoirs like Llyn Melynllyn and follow the Afon Dulyn. The area is also known for the Dulyn Bothy, a simple mountain shelter, and its poignant history as 'The Aviators Graveyard' due to past WWII plane crashes.
Yes, Llyn Dulyn is generally dog-friendly, offering vast open spaces and trails. However, as it's a mountainous region with livestock (including the Carneddau Ponies), it's crucial to keep dogs under close control, preferably on a lead, especially near grazing animals or during lambing season. Always follow the Countryside Code.
The running trails in Llyn Dulyn are highly rated by the komoot community, with an average score of 4.6 stars from around 30 reviews. Runners often praise the wild, remote beauty, the challenging ascents, and the peaceful, less crowded experience compared to other parts of Snowdonia.
Spring, summer, and early autumn generally offer the most pleasant conditions for jogging, with longer daylight hours and milder weather. However, the region's weather can be unpredictable, so always be prepared for changing conditions. Winter runs are possible but require appropriate gear and experience due to potential snow, ice, and shorter days.
While Llyn Dulyn itself is known for its lake and mountain scenery, the wider Carneddau range includes impressive waterfalls. For example, the Carnedd Llewelyn – Carnedd Dafydd loop from Aber Falls is a challenging route that starts near the famous Aber Falls, offering a chance to combine mountain running with a visit to this natural spectacle.
Parking options vary depending on your chosen starting point. Many trails, especially those leading into the Carneddau, have designated parking areas or lay-bys at trailheads. It's advisable to research specific route starting points on komoot for detailed parking information, as some remote spots may have limited facilities.
Access to the more remote Llyn Dulyn trails by public transport can be limited. However, some routes, particularly those starting from larger villages like Capel Curig, may be accessible via local bus services within Snowdonia. Planning your route in advance and checking local transport schedules is recommended.
For families, the moderate lakeside paths and less strenuous circular routes are generally more suitable. These trails offer a chance to enjoy the stunning scenery without the demands of steep mountain ascents. Always check the route's distance and elevation profile on komoot to ensure it matches your family's ability.


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