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Running trails & routes

Carnedd Llewelyn – Eigiau Dam Ruins loop from Dolgarrog

Running trails & routes

Carnedd Llewelyn – Eigiau Dam Ruins loop from Dolgarrog

Hard

4

runners

Carnedd Llewelyn – Eigiau Dam Ruins loop from Dolgarrog

02:31

16.9km

940m

Running

Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required. The starting point of the route is right next to a parking lot.

Last updated: August 22, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Parc Cenedlaethol Eryri

Waypoints

A

Start point

Parking

1

6.90 km

Carnedd Llewelyn

Highlight • Natural Monument

Carnedd Llewelyn is a rugged and wild summit that boasts incredible views of the lake Ffynnon Llugwn. With bracing mountain air to reinvigorate the senses, this peak is a must-climb …

Tip by

2

6.90 km

Carnedd Llewelyn Summit

Highlight • Summit

The eleventh summit of the Welsh 3000s and highest mountain of the Carneddau range offers you a beautiful view of the lake Ffynnon Llugwy. Connected by a ridge, you can …

Translated by Google •

Tip by

3

8.29 km

Pen y Waun Wen

Highlight • Trail

A fine scrambly route to Carnedd Llewelyn!

Tip by

4

9.04 km

Pen Yr Helgi Du

Highlight • Viewpoint

Pen yr Helgi Du is a fine summit to the southeast of Carnedd Llewelyn. It stands high above wild Cwm Eigiau and the beautiful Ffynnon Llugwy reservoir. Its summit is …

Tip by

5

11.1 km

Pen Llithrig y Wrach

Highlight • Viewpoint

Pen Llithrig y Wrach is a mountain peak in Snowdonia, North Wales. It is one of the four Marilyns that make up the Carneddau range. To the east is Creigiau …

Tip by

6

11.2 km

Llyn Cowlyd

Highlight • Lake

A lonely lake between two mountains, fed by two feeder canals.

Tip by

7

15.1 km

Eigiau Dam Ruins

Highlight • Structure

Eigiau Dam Disaster.
On 2 November 1925 the failure of two dams caused a flood that swamped the village of Dolgarrog, killing 16 people. The disaster was started by the …

Tip by

8

15.1 km

Eigiau Valley Gravel Road

Highlight (Segment) • Trail

Flat gravel road from the car park to the track junction. Nice to bike in from pen y gaer hill fort to the NE.

Tip by

B

16.9 km

End point

Parking

Way Types & Surfaces

Way Types

8.25 km

6.61 km

1.83 km

162 m

Surfaces

8.35 km

4.32 km

2.11 km

2.08 km

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Elevation

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

Highest point (1,050 m)

Lowest point (370 m)

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Weather

Powered by Foreca

Saturday 10 October

13°C

6°C

5 %

Additional weather tips

Max wind speed: 12.0 km/h

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