5.0
(6)
69
riders
10
rides
Mountain biking around Trewalchmai features a landscape characterized by significant forest areas, such as Newborough Forest and Cefni Forest, alongside large reservoirs like Llyn Cefni. The terrain includes a mix of gravel roads and paths, with some routes extending towards coastal areas and nature reserves. Elevation changes are generally moderate, making many routes accessible for various skill levels.
Last updated: April 25, 2026
5.0
(2)
24
riders
49.0km
02:54
210m
210m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(4)
22
riders
43.0km
02:37
140m
140m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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8
riders
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
3
riders
54.9km
03:14
560m
560m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
8
riders
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
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We visited for the Parkrun, which was cancelled whilst a walkway is fixed (some more weeks, I would expect). You can still access the lake along the disused railway line for part of the way - but not a good surface for running. Then there is a path around the lake with views across the lake and stretches through the woods, lovely, if rather muddy in places following wet weather. In total about 9 km around. Hope to do this again in the Spring with the promise of wild daffodils and perhaps a red squirrel.
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Quiet paths easy cycling crosses deserted railway line still present, which there trying to reopen
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Cefni Forest on Anglesey surrounds Llyn Cefni reservoir near Llangefni. It offers peaceful woodland trails for walking and cycling, linking to the Lon Las Cefni route. The forest is a sanctuary for red squirrels and diverse birdlife, making it a perfect spot for quiet nature exploration and wildlife watching.
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Very flat, easy surface, great little loop
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Llyn Cefni Dam During World War II, a water scheme was devised for the town of Llangefni in central Anglesey. It involved water from a local source being pumped to two settling tanks in the Dingle part of the town. From here the water was pumped across the river to a reservoir and water tower, on the site of the present Pennant Estate. These arrangements became redundant with the building of the Cefni Reservoir, which was completed in 1951, but the settling tanks and pumping station survive in Llangefni to this day. The new scheme was designed to supply most of the water needs for the people of Anglesey for the foreseeable future
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Malltraeth Cob Malltraeth is the next village along from Newborough to the north. The two villages are linked by a “cob” – a dike wall – with a footpath/cycle track along its top. The cob was completed in the early 19th Century, under the direction of Thomas Telford and John Rennie. At the same time, the Afon Cefni was straightened (and straitened) creating what looks like a canal, but is still tidal. This created nearly 1,600ha of grazing land on either side of the Cefni. Much of this land is now a nature reserve managed by the RSPB. Also you will see Llyn Parc Mawr Community Woodland where they have picnic areas where you can enjoyed the red squirrels. It is off road but I used my gatorskins and it was fine.
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Llangefni (meaning "church on the River Cefni", Welsh pronunciation: [ɬaŋˈɡɛvni]) population 5,116, making it the second-largest town in the county and the largest on the island. The community includes the village of Rhosmeirch. Wonderful welsh town with all the shop can get busy in summer holidays.
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The largest town on Anglesey (Holyhead is twice the size but is technically on Holy Island). Now bypassed by the island’s main roads which actually makes it a decent hub if you’re cycling across the south of the island.
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The mountain bike trails around Trewalchmai cater to a range of abilities. There are 7 easy routes, suitable for beginners or those looking for a relaxed ride, and 3 moderate routes for more experienced riders seeking a greater challenge. There are no difficult routes listed in this guide.
Trail lengths vary significantly. For instance, the Cefni Forest – Llyn Cefni Reservoir and Dam loop from Isle of Anglesey is about 7.3 miles (11.7 km) and takes around 50 minutes. Longer routes, like the Newborough Forest Trail – Llyn Cefni Dam loop from Bodorgan, extend to 30.4 miles (49.0 km) and can take nearly 3 hours to complete.
Yes, many of the trails around Trewalchmai are suitable for families, especially those looking for easier rides. Routes through areas like Cefni Forest and Newborough Forest often feature well-maintained gravel paths with moderate elevation changes, making them accessible for various skill levels. The Cefni Forest – Llyn Cefni Reservoir and Dam loop from Isle of Anglesey is an excellent easy option.
The terrain around Trewalchmai is characterized by significant forest areas, such as Newborough Forest and Cefni Forest, alongside large reservoirs like Llyn Cefni. You'll find a mix of gravel roads and paths, with some routes extending towards coastal areas and nature reserves. Elevation changes are generally moderate, offering a varied but mostly accessible riding experience.
Yes, many of the popular mountain bike routes in the Trewalchmai area are loops, offering a convenient way to explore without retracing your steps. Examples include the Newborough Forest Trail – Llyn Cefni Dam loop from Bodorgan and the Llanddwyn Beach – Newborough Forest Trail loop from Anglesey.
The trails offer views of diverse landscapes and points of interest. You can cycle alongside the Llyn Cefni Reservoir and Dam, explore the Lon Las Cefni cycle path, or pass by historical sites like the RAF Mona Airfield and the Barclodiad y Gawres Neolithic Burial Chamber.
The area is highly rated by the komoot community, with an average score of 5.0 stars from more than 5 reviews. Riders often praise the extensive forest trails, scenic reservoir loops, and the variety of routes that cater to both beginners and more experienced riders.
While there are no routes classified as 'difficult' in this guide, experienced riders can find longer, moderate trails that offer a good challenge. The Llynnon Mill – Cemlyn Bay Nature Reserve loop from Llannerch-y-Medd, for example, is a moderate 34.1-mile (54.9 km) route with over 550 meters of elevation gain, providing a more demanding ride.
While specific pubs and cafes directly on the trails are not listed, the routes often pass through or near villages and towns where you can find amenities. Planning your route to include stops in nearby communities is recommended for refreshments.
The trails are generally enjoyable in dry conditions, especially those with gravel surfaces. While many forest paths can be ridden year-round, some sections might become muddy after heavy rain. Always check local weather conditions before heading out.
This guide features 10 mountain bike trails around Trewalchmai, offering a diverse selection of routes for various skill levels and preferences.
Yes, the Llanddwyn Beach – Newborough Forest Trail loop from Anglesey is a great option that combines the coastal beauty near Llanddwyn Beach with sections through the Newborough Forest, offering a varied and scenic ride.


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