This mile-long causeway crosses River Glaslyn as it reaches the estuary. Opened in 1811, this causeway carries the Ffestiniog Railway as well as an A road and a cycle path. Riding along here gives you fantastic views north to Snowdonia’s mountains and across the wetlands of the River Glaslyn. A wall entirely blocks your view south to the estuary, but you won’t care because the mountains are so beautiful from here.

The cycle path is traffic-free so you can easily stop whenever you like to soak up the views.

Isaac Kenyon

August 15, 2020

Road cycling

Scenic ride on the road and railway bridges that cross the River Dwyryd

Andy

June 9, 2022

Road cycling

A great cycle path to keep you off the busy roads.

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#1.

Pont Aberglaslyn & the Causeway loop from Porthmadog — Snowdonia National Park

24.9km

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Easy

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#2.

The Cob Causeway – Llyn Dinas loop from Porthmadog

78.8km

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940m

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

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#3.

The Cob Causeway – Abersoch Village and Harbour loop from Penrhyndeudraeth

76.4km

03:13

500m

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

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Moderate

Details

Informations

Distance 1.23 km

Uphill 0 m

Weather

Today

Wednesday 25 March

9°C

4°C

46 %

Additional weather tips

Max wind speed: 38.0 km/h

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Take Me There

Location: Porthmadog, Gwynedd, North Wales, Wales, United Kingdom

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The Cob Causeway

#1.

Pont Aberglaslyn & the Causeway loop from Porthmadog — Snowdonia National Park

#2.

The Cob Causeway – Llyn Dinas loop from Porthmadog

#3.

The Cob Causeway – Abersoch Village and Harbour loop from Penrhyndeudraeth

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