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Routes
Bike touring routes & trails
United Kingdom
Wales
South Wales
Carmarthenshire
Ammanford

Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Ammanford

Routes
Bike touring routes & trails
United Kingdom
Wales
South Wales
Carmarthenshire
Ammanford

Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Ammanford

Hard

11

riders

Abergwesyn Valley – Llyn Brianne Dam Crossing loop from Ammanford

10:08

147km

2,230m

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: February 27, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Nant Irfon National Nature Reserve

Bannau Brycheiniog National Park

Waypoints

A

Start point

Train Station

Get Directions

44.4 km

Mynydd Bwlch-Y-Groes

Peak

2

61.0 km

Caffi Sosban

Highlight • Cafe

Great friendly cafe with a lovely garden.

Tip by

3

63.2 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

4

69.4 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

5

73.4 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

6

78.9 km

Dolgoch Hostel

Highlight • Mountain Hut

An Elenydd Wilderness Hostel. A simple and friendly hostel, hidden away in it's own secluded valley. Hot showers, loads of bunk beds and self catering kitchen. A really lovely place to stay.

Tip by

79.8 km

Cwm Du

Ruins

8

89.1 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

9

93.5 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

96.9 km

Dinas

Forest

11

123 km

View of the River Sawdde at Llangadog Common

Highlight • River

Spend a few moments on the bridge over the River Sawdde river to take in the view. A great bird watching spot, if you are patient or lucky enough you may see Sandpipers, Dipper or Kingfisher here.

Tip by

124 km

Cefn-y-coed Common

Forest

B

147 km

End point

Train Station

Loading

Way Types & Surfaces

Way Types

119 km

14.8 km

5.60 km

4.04 km

2.84 km

< 100 m

Surfaces

85.4 km

54.2 km

5.04 km

2.08 km

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Elevation

Elevation

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

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Weather

Powered by Foreca

Thursday 21 May

21°C

12°C

0 %

Additional weather tips

Max wind speed: 16.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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