Routes

Planner

Features

Updates

App

Login or Signup

Get the App

Login or Signup

Login or Signup

Routes
Bike touring routes & trails
United Kingdom
Wales
South Wales
Carmarthenshire
Llanfair-Ar-Y-Bryn

Llyn Briane Reservoir loop

Hard

7

riders

Llyn Briane Reservoir loop

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

A

Start point

Parking

Get Directions

1

1.34 km

View of Llyn Brianne Reservoir

Highlight (Segment) • Lake

Llyn Brianne is a beautiful place for a bike ride. You can stop here or carry around to the view point on the opposite side

Tip by

2

8.28 km

Gravel Route from Abergwesyn to Llyn Brianne

Highlight (Segment) • Forest

Stunning gravel over from the Irfon Valley to Llyn Brianne

Tip by

3

15.9 km

Abergwesyn Valley

Highlight (Segment) • Gorge

One of the most beautiful stretches of road in Wales or maybe the world, this valley from Abergwesyn to the well-known and much feared Devil's Staircase is an incredible place …

Tip by

4

19.9 km

Devil's Staircase Gravel Climb

Highlight (Segment) • Cycleway

An alternative climb up the infamous Devil's Staircase, but up the gravel fire road.

Gradients are more gentle than the road climb and the surface is good enough for slick tyres in good, dry conditions, so no gravel bike required!

Tip by

5

28.8 km

Capel Soar y Mynydd

Highlight • Religious Site

Capel Soar Y Mynydd is the most remote chapel in Wales. An invaluable spot to find some shelter on longer trips!

Tip by

6

38.7 km

Llyn Brianne Dam Crossing

Highlight • Bridge

Llyn Brianne is a spectacular reservoir at almost 300m (990ft) above sea level. It is Wales second largest reservoir by volume and is contained by a 91m (300ft) stone-built dam, which is the largest of its kind in Europe.

Tip by

B

39.8 km

End point

Parking

Loading

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

Sign up to see more specific route details

Sign up for free

Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (480 m)

Lowest point (260 m)

Sign up to see more specific route details

Sign up for free

Weather

Powered by Foreca

Thursday 21 May

22°C

11°C

-- %

Additional weather tips

Max wind speed: -- km/h

to get more detailed weather forecasts along your route

This route was planned by komoot.

Save

Edit route

Download GPX

Move start point

Print

Share

Embed on a website

Report an Issue

Frequently Asked Questions

How long does it typically take to cycle this loop?

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.

What is the terrain like on the Llyn Brianne Reservoir loop?

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%.

Is this route suitable for beginner cyclists?

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.

What are the main points of interest along the route?

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.

What is the best time of year to cycle this loop?

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.

Are there any permits or entrance fees required for this area?

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.

Is the Llyn Brianne Reservoir loop dog-friendly?

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.

Where can I park to start the cycling route?

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.

What wildlife might I see along the way?

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.

Does this route intersect with any other official trails?

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.

Are there any cafes or facilities available along the route?

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.

Nearby routes

Hard

5.0

56

Elan Valley and Pont-rhyd-y-groes loop from Rhayader

05:35h

68.1km

1,140m

Explore
RoutesRoute plannerFeaturesHikesMTB TrailsRoad cycling routesBikepackingSitemap
Download the app
Follow Us on Socials

© komoot GmbH

Privacy Policy