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The Cob Causeway – Harlech Castle loop from Beddgelert

The Cob Causeway – Harlech Castle loop from Beddgelert

Moderate

riders

The Cob Causeway – Harlech Castle loop from Beddgelert

02:27

53.0km

510m

Road cycling

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is right next to a parking lot.

Last updated: July 11, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Gwarchodfa Natur Genedlaethol Hafod Garegog

Parc Cenedlaethol Eryri

Waypoints

Start point

Parking

Get Directions

4.56 km

Parc y Llŷs

Forest

9.82 km

Coed Tan-yr-allt

Forest

10.4 km

Coed Tremadog National Nature Reserve

Nature Reserve

13.6 km

Porthmadog Harbour Railway Station

Highlight • Structure

The current stone buildings date from 1878/79 and replace earlier wooden buildings that had been dismantled and reused elsewhere on the railway. The goods shed was added in 1880. In …

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13.8 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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19.1 km

Pont Briwet Bridge and Estuary

Highlight • Bridge

Pont Briwet is a road and railway bridge which crosses the River Dwyryd. Built in the 19th century by the Cambrian Railway Company, the bridge is a rare example of …

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29.2 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 …

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47.4 km

Scenic Lane With Mountain Views

Highlight • Viewpoint

49.9 km

Nantmor Picnic Area

Highlight • Rest Area

A handy starting point for a walk to Aberglaslyn Pass or to Tawr Bryn Du.

NT members park free.

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50.3 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 …

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50.3 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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53.0 km

End point

Parking

Way Types & Surfaces

Way Types

45.3 km

3.86 km

2.79 km

999 m

< 100 m

Surfaces

52.5 km

399 m

< 100 m

Elevation

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

Highest point (60 m)

Lowest point (undefined)

Weather

Thursday 23 July

21°C

6°C

0 %

Additional weather tips

Max wind speed: 14.0 km/h

to get more detailed weather forecasts along your route

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The Cob Causeway – Harlech Castle loop from Beddgelert

Porthmadog Harbour Railway Station

The Cob Causeway

Pont Briwet Bridge and Estuary

Harlech Castle

Scenic Lane With Mountain Views

Nantmor Picnic Area

Pont Aberglaslyn

Stone Bridge over Afon Glaslyn

Nearby routes

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