Llyn Cwellyn – Caernarfon Castle loop from Groeslon

Llyn Cwellyn – Caernarfon Castle loop from Groeslon

Moderate

riders

Llyn Cwellyn – Caernarfon Castle loop from Groeslon

02:32

54.8km

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 17, 2026

Tips

Includes a segment in which cycling is not permitted

After 36.8 km for 102 m

Waypoints

Start point

Parking

Get Directions

257 m

Coed y Garth

Forest

6.39 km

View of Snowdon (Yr Wyddfa) Across Llyn Nantlle Uchaf

Highlight • Viewpoint

Nantle Valley is well known for its mountains and ridge. A lot of historic settlements and slate mining. Stunning views of Snowdonia. Road surface is good watch out for sheep …

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10.5 km

Drws y Coed Climb

Highlight (Segment) • Climb

A 4.3km climb in Dyffryn Nantlle with a deceptive average gradient of 3.3% with the final section closer to the maximum gradient of 12.4%.

A 4.3km climb in Dyffryn Nantlle …

Translated by Google •

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12.0 km

View of Y Wyddfa

Highlight • Other

15.4 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 …

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18.2 km

Coed Plas-y-nant

Forest

27.2 km

Old Railway Tunnel

Highlight • Structure

the old railway line is flat and gets you off the main road.

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36.2 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

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36.4 km

Caernarfon Castle

Highlight • Castle

A medieval fortress situated on the on the banks of the River Seiont, Caernarfon Castle has protected Caernarfon since the 11th century. The magnificent castle is open to visitors from …

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36.9 km

View of Caernarfon Castle

Highlight • Historical Site

Castell Caernarfon is recognised around the world as one of the greatest buildings of the Middle Ages.

This fortress-palace on the banks of the River Seiont is grouped with Edward …

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54.8 km

End point

Parking

Way Types & Surfaces

Way Types