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The Cob Causeway – Harlech Castle loop from Plas Halt

The Cob Causeway – Harlech Castle loop from Plas Halt

Hard

riders

The Cob Causeway – Harlech Castle loop from Plas Halt

06:16

132km

1,510m

Road cycling

Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride. The starting point of the route is right next to a parking lot.

Last updated: April 18, 2026

Tips

Temporary access restrictions

Includes segments with temporary access restrictions.

After 122 km for 57 m

Customers only

Waypoints

Start point

Parking

Get Directions

14.9 km

Penmachno Climb

Highlight (Segment) • Viewpoint

Crazy climb but worth the views.

Tip by

29.8 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 …

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54.1 km

Beautiful views across Llyn Dinas from the A498. Snowdon is to the north and the Watkin path starts a little further northeast up the road. Views south up onto Mynydd Llyndy which is managed by the National Trust.

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60.0 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 …

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60.0 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

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71.0 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. …

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83.1 km

Coed Camlyn

Forest

94.8 km

Coed Carreg-wen

Forest

97.3 km

Harlech Castle

Highlight • Viewpoint

Against stiff competition from Conwy, Caernarfon and Beaumaris, this is probably the most spectacular setting for an Edward I castle in North Wales. All four are recognized as World Heritage …

Translated by Google •

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119 km

Coed Tremadog National Nature Reserve

Nature Reserve

122 km

Bywyd Gwyllt Glaslyn Wildlife

Nature Reserve

128 km

Bwlch-y-maen

Mountain Pass

132 km

End point

Parking

Way Types & Surfaces

Way Types

78.4 km

46.3 km

4.39 km

2.37 km

350 m

< 100 m

Surfaces

117 km

14.0 km

350 m

208 m

< 100 m

Elevation

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

Highest point (480 m)

Lowest point (0 m)

Weather

Friday 10 July

30°C

14°C

0 %

Additional weather tips

Max wind speed: 11.0 km/h

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The Cob Causeway – Harlech Castle loop from Plas Halt

Penmachno Climb

Royal Oak Hotel, Betws-y-Coed

Llyn Dinas

Stone Bridge over Afon Glaslyn

Pont Aberglaslyn

The Cob Causeway

Harlech Castle

Nearby routes

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