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The Cob Causeway – Llyn Ogwen loop from Porthmadog

The Cob Causeway – Llyn Ogwen loop from Porthmadog

Hard

riders

The Cob Causeway – Llyn Ogwen loop from Porthmadog

05:23

112km

1,430m

Road cycling

Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is accessible with public transport.

Last updated: April 8, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Coedydd Maentwrog National Nature Reserve

Parc Cenedlaethol Eryri

Waypoints

Start point

Train Station

Get Directions

1.15 km

The Cob Causeway

Highlight (Segment) • Bridge

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. …

Tip by

11.4 km

Bwlch-y-maen

Mountain Pass

40.4 km

Royal Oak Hotel, Betws-y-Coed

Highlight • Restaurant

Betws-y-Coed is a village and community in the Conwy valley in Conwy County Borough, Wales, located in the historic county of Caernarfonshire, right on the boundary with Denbighshire, in the …

Tip by

57.4 km

Llyn Ogwen

Highlight • Natural Monument

Llyn Ogwen is a ribbon lake in north-west Wales. It lies alongside the A5 road between two mountain ranges of Snowdonia, the Carneddau and the Glyderau.

Tip by

69.7 km

Rhydau Duon

Forest

77.4 km

View of Llyn Padarn from Pont Pen-y-Llyn

Highlight • Viewpoint

On a clear day, from this end of Llyn Padarn you’ll get an enticing view of Snowdon and other peaks.
Its absolutely stunning and well worth the ride.

Tip by

89.2 km

Llyn Cwellyn

Highlight (Segment) • Natural Monument

Llyn Cwellyn is a reservoir in North Wales which supplies drinking water to parts of Gwynedd and Anglesey. It lies on the Afon Gwyrfai in Nant y Betws between Moel …

Tip by

97.7 km

View of Beddgelert and the Glaslyn River

Highlight • Viewpoint

Take care in winter months but seeing the area is wonderful watch out for cattle grids

Tip by

101 km

Stone Bridge over Afon Glaslyn

Highlight • River

The old bridge over the river or Afon Glaslyn is a great place to pause and watch the water go by. You can see down into the Aberglaslyn gorge with …

Tip by

101 km

Pont Aberglaslyn

Highlight • Viewpoint

The bridge was probably built in the 17th century and then radically rebuilt and widened in 1795-1796. As with many older bridges, folk tales claimed that the bridge was built …

Showing Translation

Tip by

103 km

Parc y Llŷs

Forest

109 km

Coed Tremadog National Nature Reserve

Nature Reserve

112 km

End point

Train Station

Way Types & Surfaces

Way Types

82.4 km

21.3 km

6.65 km

1.15 km

< 100 m

Surfaces

103 km

8.53 km

< 100 m

Elevation

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

Highest point (380 m)

Lowest point (0 m)

Weather

Wednesday 6 May

14°C

8°C

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

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The Cob Causeway – Llyn Ogwen loop from Porthmadog

The Cob Causeway

Royal Oak Hotel, Betws-y-Coed

Llyn Ogwen

View of Llyn Padarn from Pont Pen-y-Llyn

Llyn Cwellyn

View of Beddgelert and the Glaslyn River

Stone Bridge over Afon Glaslyn

Pont Aberglaslyn

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