Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Llanwrtyd

Bike touring routes & trails

Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Llanwrtyd

Hard

5.0

(1)

riders

Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Llanwrtyd

04:17

60.4km

1,050m

Cycling

Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 7, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Nant Irfon National Nature Reserve

Waypoints

Start point

Train Station

Get Directions

641 m

Caffi Sosban

Highlight • Cafe

Great friendly cafe with a lovely garden.

Tip by

2.77 km

Irfon Valley Road

Highlight (Segment) • Cycleway

A beautiful narrow road that winds up the Irfon valley from Llanwrtyd to Abergwesyn.

This is a quiet valley, often with its own microclimate.

On a good day in the …

Tip by

8.98 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

13.0 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

26.5 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

30.8 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

34.3 km

Dinas

Forest

37.1 km

Rhandirmwyn Bridge

Highlight • River

Built in 1913 the Rhandirmwyn Bridge links the two sides of the Towy valley by this rivetted girder road bridge. On the southern side you'll find the Towy Bridge Inn, a lovely riverside pub.

Tip by

37.1 km

The Towy Bridge Inn

Highlight • Pub

Delightful rural riverside location. Real ales usually from Welsh breweries. There is a large outdoor seating area with views across the river. Popular with walkers, bikers, cyclists and dogs welcome too!

Tip by

60.4 km

End point

Train Station

Way Types & Surfaces

Way Types