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View of Cemaes Bay and Harbour – Four Mile Bridge loop from Holyhead

View of Cemaes Bay and Harbour – Four Mile Bridge loop from Holyhead

Hard

160

riders

View of Cemaes Bay and Harbour – Four Mile Bridge loop from Holyhead

04:34

104km

920m

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: May 16, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Tirwedd Cenedlaethol Ynys Môn

Waypoints

Start point

Train Station

Get Directions

11.8 km

RAF Valley

Highlight • Historical Site

RAF Valley on Anglesey is home to No 4 Flying Training School, responsible for training the UK's next generation of world-class fighter pilots.

Aircrew is also trained at RAF Valley for mountain and maritime operations throughout the world.

RAF Valley is also home to the Mountain Rescue Service, the military's only high readiness, all-weather search and rescue, aircraft post-crash management asset.

Tip by

23.5 km

RAF Mona Airfield

Highlight • Historical Site

This location was first used for aviation during the First World War when the Royal Naval Air Service opened an airship base here named Royal Naval Air Station (RNAS) Anglesey (also known as RNAS Bodffordd, RNAS Gwalchmai and RNAS Llangefni).

RNAS Anglesey was commissioned on 26 September 1915, when it was operated by 14 Group RNAS, operating SS18, an SS class airship, which was later joined by airships SS22, SS24 and SS25. The station had in a large airship hangar, 120 by 318 feet (37 m × 97 m) long, workshops, hydrogen gas production sheds and accommodation huts. The airships, which could drop bombs, escorted ships and patrolled for enemy submarines in the central section of the Irish Sea between Bardsey Island, Dublin, the Isle of Man and Morecambe Bay. This area includes the approaches to the Port of Liverpool, then one of the busiest ports in the world.

Tip by

46.7 km

Moelfre Harbour and Waterfall

Highlight • Settlement

Moelfre is a pretty village on the eastern coast of Anglesey with views out across the Irish Sea towards the Forest of Bowland and the Lake District.

Tip by

65.8 km

Parys Mountain

Highlight • Cycleway

Please check your brake before decent

Tip by

70.8 km

Porth Llechog (Bull Bay)

Highlight • Settlement

The beach at Bull Bay is a very small one with shingle and rocks.

Bull Bay is a tiny coastal village on the main Anglesey road (A5025) situated between Amlwch and Cemaes Bay

The coastal village of Bull Bay is only1.5 miles from Amlwch and is entered via the Anglesey coastal road, the A5025, that hugs the beautiful coast in many places.

Tip by

76.1 km

Cemaes Harbour and Village

Highlight • Settlement

The most northerly village is Wales. Some good places to stop you will also see the wind farm from the road.

Tip by

76.5 km

View of Cemaes Bay and Harbour

Highlight • Beach

Cemaes Bay truly is a lovely everyman village with a pretty little harbour and two beaches.

Both beaches are perfect for all manner of fun beach activities, Sailing, Windsurfing and Surfing.

The Fishing can be excellent along the coast behind St Padrig's Church along the headand on the Llanbadrig Ledges.
Then, there is the absolutely staggering Anglesey Coastal Path leading to the east towards Bull Bay, Amlwch and all the way around again.
This portion of the Anglesey Coastal Path around Cemaes Bay really does take your breath away.
More or less everything that has been weighing heavy on your mind and heart dissolves away to a pleasant state of tranquil reflection.

Tip by

83.1 km

Ruins

98.0 km

Four Mile Bridge

Highlight • Bridge

The bridge itself takes the same name as the village it is situated in and is one of three bridges connecting Holy Island and Anglesey. The bridge is approximately four miles (6.5 km) from Holyhead via the old road route, giving it, and the village, its name. A bridge at this location was in existence by 1530, and was the only land route to Holyhead until the construction of the Stanley Embankment in 1823. It is 120 metres (390 ft) long and carries the B4545 road over the Cymyran strait.

I think the crossing over the water is about 5km

Tip by

104 km

End point

Train Station

Way Types & Surfaces

Way Types

76.1 km

27.2 km

770 m

455 m

< 100 m

Surfaces

99.1 km

5.32 km

< 100 m

Elevation

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

Highest point (120 m)

Lowest point (0 m)

Weather

Saturday 16 May

12°C

8°C

43 %

Additional weather tips

Max wind speed: 35.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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View of Cemaes Bay and Harbour – Four Mile Bridge loop from Holyhead

RAF Valley

RAF Mona Airfield

Moelfre Harbour and Waterfall

Parys Mountain

Porth Llechog (Bull Bay)

Cemaes Harbour and Village

View of Cemaes Bay and Harbour

Four Mile Bridge

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