4.5
(45)
305
riders
6
rides
Mountain bike trails around Llyn Dulyn are set within the remote Carneddau Mountain Range in Snowdonia, offering diverse terrain for cyclists. The region features dramatic mountain scenery with views of the Eryri Hills and coast, characterized by imposing crags and valleys. The landscape includes forest roads, exposed ridgelines, and both technical singletrack sections and flowing descents, with the serene Llyn Dulyn and Llyn Melynllyn adding to the natural features.
Last updated: July 8, 2026
5.0
(1)
11
riders
14.3km
01:05
160m
160m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
3.5
(2)
8
riders
14.1km
01:32
480m
480m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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5.0
(4)
32
riders
35.9km
02:25
470m
470m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.5
(2)
32
riders
57.1km
04:14
790m
790m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4
riders
58.6km
04:52
1,170m
1,170m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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The village of Abergwyngregyn (often shortened to Aber) is on the north coast of Wales, a few miles east of Bangor. The Mound: Pen-y-Mwd is a substantial, steep-sided, sub-circular earthwork. It is a classic Motte, which is the high mound of a motte-and-bailey castle. It measures roughly 22 feet (6.7 meters) high. Motte and Bailey: Traces of a surrounding ditch and a potential Bailey (the outer defensive enclosure) to the south-east have been identified. The motte itself has never been excavated.
1
0
The visitor centre is located on the A5, approximately 5 miles south of Bethesda and approximately 4 miles west of Capel Curig, on the western side of Llyn Ogwen. There are a number of facilities including toilets, disabled toilets, an information room, public wifi and a small kiosk selling hot and cold snacks. From the visitor centre you can start a range of walks and climbs in the area. The most popular is the walk to Wales' first ever national nature reserve, the beautiful Cwm Idwal, a glacial lake with a mountainous backdrop. (Cwm Idwal National Nature Reserve)
11
0
Standing on this bridge you have a beautiful view of Llyn Mymbyr and the mountains behind it including Snowdon. This bridge connects Plas Y Brenin National Outdoor Centre with the forests and mountains on the other side.
13
0
Great trail with views all around
0
0
perfect place to take rest and enjoy the lake view!
0
0
There are over 5 mountain bike trails available around Llyn Dulyn, offering a range of experiences from easy to difficult. The komoot community has explored these routes over 280 times.
Yes, Llyn Dulyn offers trails suitable for beginners. An excellent easy option is the Llyn Mymbyr – Bridge Over Llyn Mymbyr loop from Tryfan, which is 14.3 km long and provides scenic views of Llyn Mymbyr.
The terrain around Llyn Dulyn is highly varied, ranging from forest roads and exposed ridgelines to technical singletrack sections and flowing descents. You'll encounter both unpaved and difficult-to-ride segments, alongside more accessible paths, all set against a backdrop of dramatic mountain scenery.
Yes, many routes in the Llyn Dulyn area are designed as loops. For example, the easy Llyn Mymbyr – Bridge Over Llyn Mymbyr loop from Tryfan and the moderate View of Eryri Hills and Coast – Llyn Anafon loop from Abergwyngregyn are both circular routes, allowing you to start and finish in the same location.
Mountain biking around Llyn Dulyn offers stunning vistas. You can expect expansive views of the Eryri Hills and the coastline, as seen on the View of Eryri Hills and Coast – Llyn Anafon loop from Abergwyngregyn. Other notable features include the serene Llyn Dulyn itself, Llyn Melynllyn, and the dramatic Nant Ffrancon valley, which you can explore on the Llyn Ogwen – Nant Ffrancon Cycle Route loop from Bethesda.
Absolutely. For experienced riders seeking a challenge, the Snowdonia Slate Trail Byway – Llyn Ogwen and Ogwen Obelisk loop from Bethesda is a difficult route spanning over 56 km with significant elevation gain, offering a demanding and rewarding experience.
The Llyn Dulyn area is highly rated by the komoot community, with an average score of 4.5 stars. Reviewers often praise the dramatic mountain scenery, the sense of remote wilderness, and the diverse terrain that caters to various skill levels, from flowing descents to technical singletrack.
Yes, the Llyn Dulyn area is rich in natural beauty. You might encounter wild Carneddau ponies, adding a unique wildlife element to your ride. The routes also incorporate gorgeous streams descending from the hills, and the eerie beauty of Llyn Dulyn itself, often referred to as the 'Black Lake'.
Yes, for those looking for longer rides, the area offers several extended routes. The Tu Hwnt i'r Bont Tearoom – Snowdonia Slate Trail Byway loop from Bethesda is a moderate 57.1 km trail, providing a substantial day out on the bike.
While mountain biking is possible year-round, the best time to visit Llyn Dulyn is generally during the drier months from late spring to early autumn (May to October). This period typically offers more stable weather conditions, making the trails more enjoyable and accessible, especially on exposed ridgelines and technical sections.
While some trails can be challenging, there are options for families. The easier routes, such as the Llyn Mymbyr – Bridge Over Llyn Mymbyr loop from Tryfan, are generally more suitable for families looking for a less demanding ride with scenic views. Always check the specific route's difficulty and terrain before heading out with children.
Specific parking details vary by trailhead. Many routes start from villages like Bethesda or Abergwyngregyn, which typically have designated parking areas. It's advisable to check the starting point of your chosen route on komoot for the most accurate parking information.


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