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Caernarfon Castle – The Cob Causeway loop from Talsarnau

Caernarfon Castle – The Cob Causeway loop from Talsarnau

Hard

riders

Caernarfon Castle – The Cob Causeway loop from Talsarnau

04:11

92.9km

940m

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 25, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Gwarchodfa Natur Genedlaethol Yr Wyddfa

Parc Cenedlaethol Eryri

Waypoints

Start point

Train Station

Get Directions

10.8 km

Caer Fedw

Forest

13.9 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 by the devil or by the Romans (which an investigation by the National Trust described as "very doubtful"). During the reconstruction, a stone was found with the inscription "W M 1656" scratched on it, suggesting that the bridge is at least that old.
Pont Aberglaslyn is located near the downstream end of the Aberglaslyn Pass. Although the location is rocky and the river flows through rapids upstream, it is not far above sea level.
(Wikipedia)

Showing Translation

Tip by

13.9 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 the rocky fisherman's path cutting its way along the opposite bank.
The bridge itself is a grade 2 listed 17th century stone construction.

Tip by

19.3 km

Coed Pant-agored

Forest

19.8 km

Llyn Dinas

Highlight • Natural

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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24.2 km

Pen-y-Pass Ascent from Nant Gwynant

Highlight (Segment) • Viewpoint

Voted one of the ten most iconic climbs in Wales, you have to conquer this climb. It climbs gently enough from Nant Gwynant to the summit of Pen y Pass for approximately 6km.

Translated by Google •

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30.0 km

Pen-y-Pass

Mountain Pass

30.1 km

Llanberis Pass – Pen-y-Pass Climb

Highlight (Segment) • Climb

Awesome mountain road from Nant Peris in the west to the top of Pen-y-pass in the east. It's a long climb up from Nant Peris or an exciting descent in the other direction. The A4086 follows the Llanberis Pass with historically important rock climbing and bouldering on both sides. Snowdon is to the south and the Glyders to the north.
Café and shop at the car park at the top along with the YHA Pen-y-pass. There is a nice pub in Nant Peris and cafes and shops in Llanberis a bit further down the road,

Tip by

39.3 km

View of Llyn Peris

Highlight (Segment) • Viewpoint

51.3 km

Caernarfon Castle

Highlight • Monument

Royal fortress-palace built on legends and bitter medieval conflict Caernarfon Castle is recognised around the world as one of the greatest buildings of the middle ages

Tip by

83.9 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. 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.

Tip by

92.9 km

End point

Train Station

Way Types & Surfaces

Way Types

53.1 km

27.8 km

9.92 km

2.09 km

< 100 m

Surfaces

91.6 km

1.19 km

164 m

< 100 m

Elevation

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

Highest point (360 m)

Lowest point (0 m)

Weather

Wednesday 8 July

26°C

11°C

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Caernarfon Castle – The Cob Causeway loop from Talsarnau

Pont Aberglaslyn

Stone Bridge over Afon Glaslyn

Llyn Dinas

Pen-y-Pass Ascent from Nant Gwynant

Llanberis Pass – Pen-y-Pass Climb

View of Llyn Peris

Caernarfon Castle

The Cob Causeway

Nearby routes

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