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Hay

Llanthony loop from Hay-on-Wye

Hard

66

runners

Llanthony loop from Hay-on-Wye

05:25

41.9km

1,330m

Running

The Llanthony loop from Hay-on-Wye is a difficult jogging route that takes you through varied terrain and offers expansive views across both the Welsh and English countryside. You will experience the secluded Vale of Ewyas, a steep-sided valley in the Black Mountains, before reaching the Hatterall Ridge for panoramic vistas. The trail covers 26.0 miles (41.9 km) and involves a significant elevation gain of 4359 feet (1329 metres). Expect a challenging run that will take around 5 hours and 24 minutes to complete, making it suitable for experienced joggers with good fitness. Along the way, you'll pass through open moorland and wooded areas, with glimpses of prominent peaks like Hay Bluff and Twmpa. You might even spot Sugar Loaf mountain in the distance.

Before you set out on this difficult jogging route, be sure to wear sturdy shoes and prepare for varied surfaces. While many paths are accessible, some sections require careful footing, especially on unpaved segments of gravel and natural ground. Parking is typically available near Llanthony Priory, which also provides toilets and sometimes a cafe or bar. Plan your start time carefully to ensure you have ample daylight for the full 5 hours and 24 minutes of jogging.

This route stands out for its journey through the historic Vale of Ewyas, a dramatic valley within the Black Mountains. The trail's significant length and elevation gain make it a notable challenge in the Brecon Beacons National Park. You will encounter a diverse landscape that blends open moorland with sheltered wooded areas, offering a rich experience of the region's natural beauty. The combination of demanding terrain and historical landmarks makes this loop a rewarding adventure.

Last updated: April 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Brecon Beacons National Park

Waypoints

A

Start point

Parking

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1

17.4 km

Llanthony Priory

Highlight • Religious Site

What a fantastic place. Touch of history.

Tip by

2

26.2 km

Grwyne Fawr Reservoir

Highlight • Historical Site

Highly recommend ❤️
Gwyne Fawr Reservoir -is located in the valley of the river Grwyne Fawr in the Brecon Beacons National Park, Wales. Completed in 1928, it has the capacity to hold 400,000,000 imperial gallons of water... There were Serious water shortages in most parts of the historic county of Monmouthshire. In fact By the end of the 19th-century, The area had seen a massive population increase as a result of the steel and coal industries but the supply of water to the area was complicated due to its high altitude. A site for a New Reservoir was chosen at the head of the Grwyne Fawr Valley mainly because at the height of, 1,725 ft / 526m above sea level making it the perfect plan with it being high enough to allow all of the Reservoirs water to be freely gravity fed to Abertillery and the surrounding areas. Work started 1912, but immediately hit numerous problems.
The road up the valley could not take the weight of the heavy traction engines used for haulage. So It was decided that a new railway would be required. Then hit the first world war and proceedings were put on hold. Work recommenced 1919, the railway was completed, connected to the main line at Llanvihangel Crucorney. A village of construction workers and their families grew in the valley at Blaen-y-cwm. A community of some 300 people lived there with a hostel, canteen, day school, police station and hospital. Workmen quarried 200,000 tons of sandstone for the construction of the dam. Large boulders weighing up to 5 tons each were set in concrete to form the dam, which is 130 feet thick at its base, the walls were then faced with dressed stone. A 16-inch diameter steel pipeline was tunnelled through Coity Mountain carrying water to a holding reservoir in Cwmtillery.
The dam was finally completed in February 1928, after which the railway and structures that served its construction were quickly dismantled including the workers village. The total cost of construction was reported to be £1 million.

Tip by

3

30.1 km

Rhos Dirion summit

Highlight • Natural Monument

Rhos Dirion is a summit in the Black Mountains. It is the highest point on the Rhos Dirion-Chwarel y Fan ridge and the summit is marked by a trig point. Rhos Dirion is a UK-listed Nuttall.

Tip by

B

41.9 km

End point

Parking

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Way Types & Surfaces

Way Types

20.8 km

16.4 km

3.62 km

433 m

328 m

325 m

Surfaces

28.3 km

6.84 km

3.64 km

2.81 km

328 m

< 100 m

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Elevation

Elevation

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Weather

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Tuesday 7 July

30°C

12°C

0 %

Additional weather tips

Max wind speed: 13.0 km/h

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Frequently Asked Questions

How challenging is the Llanthony loop from Hay-on-Wye for jogging?

This route is considered a difficult run, best suited for experienced joggers with very good fitness. It covers approximately 41.9 km (26 miles) with a significant elevation gain of 1,328 meters (4,363 ft), taking around 5 hours and 25 minutes to complete. Sure-footedness and sturdy footwear are highly recommended due to the varied terrain and steep sections.

What is the terrain like on this jogging route?

The terrain is quite diverse. While it features mostly accessible paths, some sections require careful footing. You'll encounter a mix of hiking paths, footpaths, and shorter stretches of track, street, and road. A significant portion (about 28.3 km) is unpaved, with gravel and natural surfaces. Expect steep climbs, especially from Llanthony Priory, and exposed, potentially windy ridges. Parts of the Offa's Dyke Path are laid with coarse gravel and limestone slabs for a firmer surface.

What are the main points of interest along the Llanthony loop?

The route offers stunning scenery and historical landmarks. You'll pass by the atmospheric ruins of Llanthony Priory, experience the secluded Vale of Ewyas, and traverse the Rhos Dirion summit. Other highlights include the Hatterall Ridge, Hay Bluff, and Twmpa (Lord Hereford's Knob), all offering panoramic views. You might also spot the Grwyne Fawr Reservoir and distant views of Sugar Loaf mountain.

Does the route intersect with any other well-known trails?

Yes, the route incorporates sections of several other notable trails. You'll follow significant portions of the Offa's Dyke Path (41% of the route), as well as parts of the Cambrian Way (22%), EuroVelo 2 - Capitals Route (16%), National Cycle Network Route 42 (16%), and the Beacons Way (7%).

Is the Llanthony loop from Hay-on-Wye dog-friendly?

While dogs are generally welcome in the Brecon Beacons National Park, it's crucial to keep them on a lead, especially near livestock and during ground-nesting bird season (March-July). Given the challenging terrain and length of this particular route, ensure your dog is fit enough for a long, strenuous run. Always carry water for your dog.

What is the best time of year to jog this loop?

Spring and autumn generally offer the most pleasant conditions for jogging this loop, with milder temperatures and often clearer views. Summer can be beautiful but also very warm, especially on exposed ridges. Winter brings the possibility of snow and ice, making the already challenging terrain even more difficult and potentially hazardous. Always check the weather forecast before you go, as conditions can change rapidly in the mountains.

Where can I park to access the Llanthony loop, and are there any facilities?

Many people start this loop from Llanthony Priory, which typically offers parking. The Priory area also often has toilets and sometimes a cafe/bar, making it a convenient starting or stopping point. Parking availability can vary, especially during peak times, so it's advisable to arrive early.

Are there any permits or entrance fees required to jog this trail or enter Brecon Beacons National Park?

No, there are no specific permits or entrance fees required to jog the Llanthony loop or to enter the Brecon Beacons National Park itself. However, you may need to pay for parking at specific car parks, such as at Llanthony Priory. Always adhere to the Countryside Code and respect the local environment.

What kind of views can I expect along the route?

Prepare for truly spectacular scenery! The route offers 'big views' and sweeping panoramas across both the Welsh and English countryside. You'll experience the secluded Vale of Ewyas, expansive vistas from the Hatterall Ridge, and around Hay Bluff, the wide Wye Valley begins to emerge. On clear days, you can see the hills and mountains of mid-Wales, as well as landmarks like Sugar Loaf mountain. The mix of wooded areas and open moorland provides a constantly changing and beautiful backdrop.

What should I wear and bring for this challenging jogging route?

Given the route's difficulty and varied terrain, wear sturdy trail running shoes with good grip. Layered clothing is essential, as conditions on exposed ridges can be windy and change quickly. Bring waterproof and windproof outer layers, even in milder seasons. Carry plenty of water, high-energy snacks, a map and compass (or a reliable GPS device), a first-aid kit, and a fully charged phone. Sun protection is also advisable.

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