Llyn Briane Reservoir loop
Llyn Briane Reservoir loop
7
riders
03:32
39.8km
900m
Cycling
This difficult 24.8-mile touring cycling loop around Llyn Brianne Reservoir in the Cambrian Mountains offers dramatic scenery and challengin
Last updated: February 26, 2026
Waypoints
Start point
Parking
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1.34 km
Highlight (Segment) • Lake
Tip by
8.28 km
Highlight (Segment) • Forest
Tip by
15.9 km
Highlight (Segment) • Gorge
Tip by
19.9 km
Highlight (Segment) • Cycleway
Tip by
28.8 km
Highlight • Religious Site
Tip by
38.7 km
Highlight • Bridge
Tip by
39.8 km
End point
Parking
Way Types & Surfaces
Way Types
19.8 km
19.8 km
229 m
Surfaces
20.7 km
16.3 km
2.58 km
229 m
< 100 m
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Elevation
Highest point (480 m)
Lowest point (260 m)
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Weather
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Thursday 21 May
22°C
11°C
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This route was planned by komoot.
This challenging route is approximately 39.8 km (24.7 miles) long. Komoot estimates it takes around 3 hours and 30 minutes to complete, but this can vary significantly based on your fitness level and how often you stop to enjoy the views.
The terrain is predominantly hilly and demanding, featuring significant ascents and descents. You'll encounter winding roads, some narrow single-track mountain lanes, and potentially unpaved or difficult segments. A notable feature is the infamous Devil's Staircase Gravel Climb, known for its savage steepness with gradients up to 25-30%.
No, this route is generally considered hard or even extreme, requiring a very good level of fitness. With substantial elevation gain and challenging sections like the Devil's Staircase, it's not recommended for beginners. Some segments may even require pushing your bike.
You'll encounter several stunning features, including panoramic views of the Llyn Brianne Reservoir, the impressive Llyn Brianne Dam Crossing (the tallest in the UK), and the picturesque Abergwesyn Valley. The route also passes by Capel Soar y Mynydd, Wales' remotest chapel, and offers a challenging Gravel Route from Abergwesyn to Llyn Brianne.
Spring is particularly beautiful, with bluebells carpeting the woodlands. However, the route offers breathtaking views year-round. Be prepared for varied weather conditions, as the Welsh mountains can be unpredictable. Always check the forecast before you go.
No, there are no specific permits or entrance fees required to cycle this route around Llyn Brianne Reservoir. The area is part of the Cambrian Mountains, which is open access for recreation.
While not explicitly restricted, the route traverses remote areas with abundant wildlife such as red squirrels and red kites, and potentially livestock. If you bring your dog, please keep them on a leash at all times and be mindful of other cyclists and animals.
Given the remote nature of the area, facilities are limited. Informal parking spots can be found near the reservoir, particularly around the dam or at the start of some of the access roads. It's advisable to arrive early, especially during peak seasons, as designated parking areas are scarce.
The route passes through the picturesque Tywi Forest and open moorland, offering opportunities to spot diverse wildlife. Keep an eye out for red squirrels and the majestic red kites soaring overhead. Depending on the season, you might also see various bird species and other local fauna.
Yes, sections of this route overlap with the Soar-Y-Mynydd trail, which covers approximately 2% of the loop. This gives you a taste of other paths in the area.
Due to the remote nature of the region, facilities are very limited along the route. It's crucial to carry all necessary supplies, including water, snacks, and any emergency gear. There are no cafes or pubs directly on the loop, so plan accordingly for your hydration and nutrition needs.