4.6
(524)
4,660
hikers
64
hikes
Hiking around Glasfynydd Forest offers diverse landscapes within the Bannau Brycheiniog (Brecon Beacons) National Park. The area features extensive coniferous plantations, woodlands, and the Usk Reservoir, which serves as a central point of interest. Hikers can experience views across the reservoir to the Black Mountains and explore varied habitats including forest, grassland, and moorland. The terrain ranges from mostly level, stoned tracks to more challenging ascents.
Last updated: May 11, 2026
4.6
(29)
285
hikers
10.3km
02:46
130m
120m
Hike the moderate 6.4-mile Usk Reservoir Trail in Bannau Brycheiniog National Park, enjoying tranquil lake views and forest paths.
4.8
(4)
28
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Sign up for free
5.0
(1)
3
hikers
20.6km
06:14
650m
650m
Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.
2
hikers
4.50km
01:13
60m
60m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
3
hikers
6.45km
01:44
90m
80m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
Ideal for a lap with human and animal
0
0
Quite a tricky path. Easier up than down I reckon. I did it with a wonky arm so don’t worry too much.
0
0
Moderate trail for all to explore and enjoy the beautiful sceneries
2
1
Moderate trail for most to enjoy, light elevation and amazing views on a clear day
1
1
Glasfynydd Forest offers a diverse range of hiking trails suitable for various fitness levels. You'll find everything from easy, mostly level paths to more challenging routes with significant elevation gain. There are 14 easy routes, 42 moderate routes, and 8 difficult routes available for exploration.
Yes, Glasfynydd Forest has several easy trails perfect for families. A popular option is the Usk Reservoir loop from Usk Reservoir Dam, which is about 4.5 km long and takes around 1 hour 12 minutes. Another accessible choice is the Hiking loop from Usk Reservoir, spanning 6.4 km and typically completed in about 1 hour 44 minutes. These trails often follow wide, stoned tracks.
Glasfynydd Forest is generally dog-friendly, offering many trails where you can enjoy a walk with your canine companion. However, it's always recommended to keep dogs under control, especially around livestock or wildlife, and to check specific trail regulations for any restrictions. The Usk Reservoir area is a popular spot for walks with dogs.
Yes, circular walks are a highlight of Glasfynydd Forest. The well-known Usk Reservoir Trail is a moderate 10.3 km circular route that follows the reservoir's edge. For a shorter, easier option, consider the Usk Reservoir loop from Usk Reservoir Dam. More challenging circular options, like the Fan Foel summit – Llyn y Fan Fawr loop from Usk Reservoir, are also available for experienced hikers.
Hikers in Glasfynydd Forest can enjoy a landscape characterized by extensive coniferous woodlands, the scenic Usk Reservoir, and far-reaching views towards the majestic Black Mountains. The area is also known for its diverse habitats, supporting various wildlife, and is recognized as an International Dark Sky Reserve, offering exceptional stargazing opportunities.
Glasfynydd Forest offers unique experiences throughout the year. Spring and autumn provide pleasant temperatures and beautiful foliage. Summer is ideal for longer days and enjoying the reservoir, while winter can offer crisp, clear views, though some trails might be muddy. Birdwatchers will find different species depending on the season, with Eurasian Nightjars in summer and Great Grey Shrikes in winter.
The komoot community highly rates Glasfynydd Forest, with an average score of 4.6 stars from over 500 reviews. Hikers frequently praise the tranquil atmosphere of the woodlands, the stunning views across the Usk Reservoir to the Black Mountains, and the variety of well-maintained trails suitable for different abilities.
Yes, for those seeking a challenge, Glasfynydd Forest offers several difficult routes. A notable example is the Fan Foel summit – Llyn y Fan Fawr loop from Usk Reservoir. This 20.6 km trail leads through varied mountain terrain and typically takes over 6 hours to complete, requiring very good fitness.
Parking is generally available at key access points around Glasfynydd Forest, particularly near the Usk Reservoir. For instance, the Usk Reservoir Trail has convenient picnic benches located in the car park and along the trail, indicating designated parking facilities for hikers.
Glasfynydd Forest is rich in wildlife due to its diverse habitats. Birdwatchers might spot Red Kites, Buzzards, European Stonechat, Red Grouse, Common Redstart, and the elusive Eurasian Nightjar in summer. Winter brings sightings of Great Grey Shrike, Common Crossbill, and Eurasian Siskin. White-throated Dipper and Grey Wagtail can be found near the dam, and hares have also been observed in the area.
Yes, Glasfynydd Forest is part of an International Dark Sky Reserve, known as the 'heart of darkness.' This designation means the area offers some of the darkest skies in Wales, providing exceptional opportunities for stargazing and enjoying the night sky away from light pollution.
There are over 60 hiking routes available in Glasfynydd Forest, catering to a wide range of preferences and fitness levels. This includes 14 easy, 42 moderate, and 8 difficult trails.


Browse the best Hikes in other regions.