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The Menai Straight, Caernarfon Castle & Llyn Cwellyn loop — Snowdonia National Park

The Menai Straight, Caernarfon Castle & Llyn Cwellyn loop — Snowdonia National Park

Moderate

5.0

(2)

riders

The Menai Straight, Caernarfon Castle & Llyn Cwellyn loop — Snowdonia National Park

03:08

64.5km

650m

Road cycling

Embark on a moderate road cycling adventure that combines coastal beauty with mountain drama. This 40.1-mile (64.5 km) loop takes you along the Menai Strait, offering views across to the Isle of Anglesey, before heading inland towards the rugged landscapes of Snowdonia National Park. You will pass the historic Caernarfon…

Last updated: April 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc Cenedlaethol Eryri / Snowdonia National Park

Castles and Town Walls of King Edward in Gwynedd WHS

Waypoints

Start point

Bus stop

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14.8 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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18.1 km

Lon Las Menai Cycleway

Highlight (Segment) • Cycleway

Lon Las Menai and Lon Las Ogwen are great routes for all cycling abilities; completely without traffic. A safe space shared by people with the same interests.

Translated by Google •

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29.9 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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34.0 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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38.9 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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52.8 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.

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64.5 km

End point

Bus stop

Way Types & Surfaces

Way Types

33.3 km

16.4 km

14.1 km

740 m

Surfaces

47.6 km

16.4 km

326 m

148 m

Elevation

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

Highest point (240 m)

Lowest point (10 m)

Weather

Wednesday 27 May

26°C

14°C

31 %

Additional weather tips

Max wind speed: 32.0 km/h

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This route was planned by komoot.

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The Menai Straight, Caernarfon Castle & Llyn Cwellyn loop — Snowdonia National Park

Caernarfon Castle

Lon Las Menai Cycleway

View of Snowdon (Yr Wyddfa) Across Llyn Nantlle Uchaf

Drws y Coed Climb

Llyn Cwellyn

View of Llyn Padarn from Pont Pen-y-Llyn

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