4.6
(37)
2,263
riders
11
rides
No traffic road cycling routes around Llyn Cwellyn are set within Eryri National Park, characterized by a deep glacial moraine lake and a dramatic mountainous backdrop including the Snowdon massif and Mynydd Mawr. The region features quiet roads and former railway lines, offering diverse terrain for road cyclists. Views often extend over the lake, forested valleys, and distant peaks like Moel Hebog and the Nantlle Ridge. This area provides a mix of challenging ascents and gentler, traffic-free paths.
Last updated: October 2, 2026
23
riders
25.0km
01:36
600m
600m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
11
riders
42.3km
02:20
570m
570m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

8
riders
21.3km
00:56
170m
170m
Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.
3
riders
42.7km
02:15
750m
750m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
3
riders
20.4km
01:40
510m
510m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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Popular around Llyn Cwellyn
the old railway line is flat and gets you off the main road.
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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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This is a class section, often used by MTB and Road bikers. If you look closer you can see where?
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Always a pleasure to ride around this area with the castle as a back drop.
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Llyn Cwellyn is a reservoir in North Wales which supplies drinking water to parts of Gwynedd and Anglesey. It lies on the Afon Gwyrfai in Nant y Betws between Moel Eilio and Mynydd Mawr in the northern part of Snowdonia National Park. It has an area of 215 acres, and is over 120 ft deep. It has amazing views well worth a stop.
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There are over 10 dedicated no traffic road cycling routes around Llyn Cwellyn, offering a variety of distances and challenges. These routes are designed to provide a serene cycling experience away from heavy vehicle traffic.
The road cycling routes around Llyn Cwellyn primarily range from moderate to challenging. While there are a couple of easier options, most routes feature significant elevation changes, with climbs up to 747 meters. For example, the View of Llyn Peris – Ford Crossing with Footbridge loop from Llanberis includes over 740 meters of ascent.
You can expect a mix of well-maintained tarmac roads and dedicated cycle paths. The region is characterized by its dramatic mountainous landscape, so routes often feature undulating terrain, lakeside stretches, and occasional climbs offering panoramic views of Snowdon, Mynydd Mawr, and the surrounding valleys.
Yes, many of the no traffic road cycling routes around Llyn Cwellyn are designed as circular loops, allowing you to start and finish at the same point. An example is the Caernarfon Castle – Caernarfon Castle loop from Llanberis, which offers a substantial circular ride.
Spring and autumn generally offer the most pleasant conditions for cycling around Llyn Cwellyn, with milder temperatures and fewer crowds. Summer can be beautiful but also busier, while winter can bring challenging weather, including rain and colder temperatures, though the scenery remains stunning.
The routes offer breathtaking views of Llyn Cwellyn itself, nestled between the Snowdon massif and Mynydd Mawr. You might also catch glimpses of Moel Eilio, Moel Hebog, and the Nantlle Ridge. Keep an eye out for Castell Cidwm (Wolf Castle), a striking natural rock formation at the northern end of the lake. Some routes, like the Caernarfon Castle loop, even extend to historic sites like Caernarfon Castle.
Yes, parking is generally available at various points around Llyn Cwellyn and in nearby villages like Llanberis or Rhyd Ddu, which serve as common starting points for many routes. Specific parking areas may vary, so it's advisable to check local signage.
Yes, the Welsh Highland Railway runs past Llyn Cwellyn, offering a scenic way to access the area. While it's primarily a heritage railway, it provides connections between Caernarfon and Porthmadog, with stops near the lake. Check their schedule for details on transporting bikes.
For families or those seeking easier rides, the Lôn Gwyrfai Lakeside Path offers a moderate bike ride with beautiful lakeside views. The Lôn Eifion Cycleway, partly following an old railway line, is another excellent traffic-free option with scenic views of Caernarfon Bay and Snowdonia's mountains, suitable for a more relaxed pace.
The Llyn Cwellyn area is highly rated by the komoot community, with an average score of 4.5 stars. Reviewers often praise the stunning mountainous backdrops, the tranquility of the traffic-free sections, and the rewarding climbs that offer expansive views over the lake and surrounding landscapes.
While Llyn Cwellyn itself is quite rural, nearby villages such as Llanberis and Rhyd Ddu offer a selection of cafes, pubs, and other amenities where you can refuel and relax during or after your ride. It's a good idea to plan your route to include these stops.
Generally, dogs are welcome on many public paths and cycle routes in Eryri National Park, provided they are kept under control, preferably on a lead, especially near livestock. Always follow the Countryside Code and respect local signage regarding dog access.


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