3.9
(14)
1,649
runners
90
runs
Jogging routes around Trewalchmai offer a variety of paths, primarily characterized by the presence of water bodies such as the Llyn Cefni Reservoir and the Afon Cefni River. The terrain is generally gentle, with low elevation gains, making it suitable for various fitness levels. These running routes provide opportunities to explore the local countryside and its natural features.
Last updated: May 11, 2026
18
runners
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
14
runners
12.9km
01:22
100m
100m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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7
runners
10.4km
01:07
120m
120m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
7
runners
5.12km
00:33
80m
80m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
8
runners
Moderate run. Good fitness required. Mostly paved surfaces. 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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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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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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Located in Llangefni right out side the nature reserve the dingle
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A absolute pleasure to walk in such a beautiful perfect setting with RED SQUIRREL EVERYWHERE
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There are over 90 running routes in the Trewalchmai area, offering a wide variety of options for different fitness levels and preferences.
Running trails in Trewalchmai vary in length and difficulty. While most of the 90+ routes are considered moderate, there are also 8 easy routes and 15 challenging routes. Distances range, with popular options like the Llyn Cefni Reservoir and Dam – Afon Cefni River loop at 4.8 miles (7.8 km) and the Llyn Cefni Reservoir and Dam – Llyn Cefni Dam loop at 8.0 miles (12.9 km).
Yes, Trewalchmai offers 8 easy running routes perfect for beginners or families. These routes typically feature gentle terrain and lower elevation gains, making them accessible for a relaxed run or jog. The area's focus on reservoirs and rivers often means flat, scenic paths.
The running routes in Trewalchmai are characterized by water bodies such as the Llyn Cefni Reservoir and Dam and the Afon Cefni River. You might also encounter the Lon Las Cefni cycle path, which runs along the Afon Cefni, and various historical sites like RAF Mona Airfield or the Barclodiad y Gawres Neolithic Burial Chamber.
Many running routes in Trewalchmai are suitable for dogs, especially those traversing open countryside or along reservoir paths. However, it's always recommended to keep dogs on a leash, especially near livestock or protected wildlife areas, and to check specific route guidelines for any restrictions.
Yes, many of the running routes around Trewalchmai are circular, allowing you to start and finish at the same point. Examples include the Llyn Cefni Reservoir and Dam – Afon Cefni River loop and the Running loop from Capel Mawr.
The running routes in Trewalchmai are highly rated by the komoot community, with an average score of 3.8 stars from more than 10 reviews. Runners often praise the scenic views of the reservoirs and rivers, as well as the generally gentle and accessible terrain.
While specific parking information varies by trailhead, many popular running areas, especially those around Llyn Cefni Reservoir, typically offer designated parking facilities. It's advisable to check the route details on komoot for specific parking recommendations for your chosen trail.
Access to running routes by public transport in Trewalchmai can be limited, as many trails are in rural areas. However, some routes may be accessible from villages or towns with bus services. Planning your journey in advance and checking local transport schedules is recommended.
Trewalchmai offers pleasant running conditions throughout much of the year. Spring and autumn provide mild temperatures and beautiful scenery. Summer is also popular, though it can be warmer. Winter running is possible, but paths might be wet or muddy, especially along the reservoir and river banks.
Yes, for experienced runners seeking a challenge, Trewalchmai offers 15 difficult routes. These trails may feature longer distances or slightly more varied terrain, providing a good test of endurance. The Llyn Cefni Reservoir and Dam – Afon Cefni River Trail loop, at 7.5 miles (12.1 km) with moderate elevation, offers a good longer option.
Given the presence of Llyn Cefni Reservoir and the Afon Cefni River, you may spot various waterfowl and bird species. The surrounding countryside also supports local wildlife, so keep an eye out for common birds and small mammals typical of rural Anglesey.


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