Best attractions and places to see around St. Harmon include a blend of natural beauty, historical landmarks, and cultural insights. Situated on the Afon Marteg, the village is located between Llanidloes and Rhayader. The area is known for its proximity to the Elan Valley Reservoirs and the Gilfach Nature Reserve. This region offers diverse outdoor activities and opportunities to explore local heritage.
Last updated: May 6, 2026
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Beautiful church - well worth exploring
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Elan Valley is a mountain bikers dream. A mix of natural trails that follow the reservoirs and crest the lofty tops of each valley. There's also a great trailhead in the middle of the valley at Nantgwyllt for some great flowing singletrack.
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The downhill stretch of the road is now almost completely washed away. So there is no descent to be had on the bike. If you're on a full suspension bike it might just be doable but anything else - or bikepacking - you'll be walking.
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The old church, along with the manor house and nearby cottages, were enveloped by the waters and lost forever when Caban Coch dam was built. Among the lost houses was Cwm Elan, once the home of poet Percy Bysshe Shelley's uncle. Shelley visited on several occasions and fell in love with the area. In 1812 he tried to buy Nantgwyllt House, as a home to settle into with his wife Harriet. The old church at Nantgwyllt may have been lost, but in 1898 a new church was begun on high ground overlooking the Garreg-ddu viaduct. The architect was Stephen W Williams, who also built Elan Village to house workmen labouring to build the dams. The new church was erected at the southern end of the viaduct.
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Pen y Garreg Dam third of the Elan Valley Dams, also known as the middle dam. This dam houses an access tunnel to the central tower which is lit by apertures in the downstream side of the dam. Height - 123 ft above river bed. Beautiful scenery a great ride around this area.
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Seems to be a victim of Arwen + 4x4s with big gullies that could end your career and really rough slate undressed surface. The initial ramp southward is just about unrideable. I'd say this is mountain bike only at this point, though an unloaded gravel bike might stand a chance. Great once you reach the top if heading south. See the last photos on this highlight for the condition in June 24.
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One of the most iconic reservoir created to provide water to Birmingham
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The area around St. Harmon is rich in history. You can visit Nantgwyllt Church, a small chapel rebuilt after an earlier one was flooded during the construction of the Elan Valley dams. St Garmon's Church in the village itself has historical significance, reputedly founded in the 6th century. Additionally, the former St Harmons Railway Station offers a glimpse into the area's past connectivity, and the Gilfach Longhouse within the Gilfach Nature Reserve provides insight into traditional Welsh life. Don't miss the Rhayader Town Clock, a central landmark in the nearby market town.
Absolutely. The most prominent natural features are the Elan Valley Reservoirs, including the impressive Caban-Coch Dam and Reservoir, which offers stunning views and a cycle path along its lakeshore. You can also visit Pen-y-Garreg Dam, known for its unique access tunnel. The Gilfach Nature Reserve, located at the confluence of the Afon Marteg and River Wye, provides diverse habitats and opportunities for birdwatching and enjoying waterfalls.
The region is ideal for outdoor enthusiasts. You can enjoy various activities such as hiking, running, and gravel biking. For hiking, explore routes like the 'Rhayader Town Centre – Afon Elan Suspension Bridge loop' or the 'Elan Valley Trail – Elan Valley Visitor Centre loop'. Gravel biking options include the 'Elan Valley loop from Rhayader' or the 'Caban-Coch Dam and Reservoir – Craig Goch Dam loop'. You can find more details on these and other routes on the respective guide pages for Hiking around St. Harmon, Running Trails around St. Harmon, and Gravel biking around St. Harmon.
Yes, the area offers several family-friendly options. The Elan Valley Reservoirs, including Pen-y-Garreg Dam, are great for families to explore. The Gilfach Nature Reserve has well-laid-out, sign-posted trails that are suitable for family walks, allowing children to discover wildlife and nature. Many of the easier walking routes around the Elan Valley are also suitable for families.
The Gilfach Nature Reserve is a spectacular area, once a working hill farm, nestled in the Marteg Valley. It boasts a wide variety of habitats, from high moorland to oak woodland, supporting abundant birds and animals like Red Kites, Dippers, and Pied Flycatchers. Visitors can explore sign-posted trails, see the historic Welsh Longhouse farmhouse, and observe salmon leaping in the waterfalls during autumn. It's a fantastic spot for nature lovers and birdwatchers.
Cycling is a popular way to explore the area, especially around the Elan Valley Reservoirs. The Caban-Coch Dam and Reservoir features a dedicated cycle path along its lakeshore. The 'Mohican Road' highlight is also infamous among cyclists for its challenging terrain and beautiful scenery. There are numerous gravel biking routes that connect the various dams and natural landscapes, offering exhilarating rides.
Visitors frequently praise the stunning natural beauty and the impressive engineering of the dams. Many highlight the peaceful and remote feeling of places like the 'Mohican Road' and the opportunity to relax and take in the views at spots like Caban-Coch Dam and Reservoir. The historical significance of sites like Nantgwyllt Church and the charm of Rhayader as a stopping point are also highly appreciated.
Beyond the dams themselves, which offer magnificent views, the Gilfach Nature Reserve provides several scenic spots with diverse landscapes. The 'Mohican Road' is known for its real wilderness feel and beautiful scenery. For a broader perspective, Pegwn Mawr, a mountain east of Llanidloes, offers a trig-pointed summit with expansive views of the surrounding area, including a wind farm.
The Elan Valley Reservoirs, including Caban-Coch Dam and Reservoir and Pen-y-Garreg Dam, are a series of impressive structures built to supply drinking water to Birmingham. They are not only vital for water supply but also stand as significant engineering feats nestled within a beautiful natural landscape, offering recreational opportunities and stunning vistas.
Cefn Cenarth Nature Reserve features two areas of upland sessile oak woodland. This reserve is particularly important for its rich diversity of mosses and lichens, and it supports a wide range of breeding birds and other wildlife. It offers another opportunity to experience the natural beauty and biodiversity of the St. Harmon area.
The area is generally pleasant for outdoor activities from spring through autumn. Spring brings blooming wildflowers and active wildlife, while autumn offers vibrant foliage and the chance to see salmon leaping in the Gilfach Nature Reserve waterfalls. Summer is ideal for longer days and warmer weather for hiking and cycling. Winter can be beautiful but may present more challenging conditions for some trails.


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