Natural monuments around Myddfai are situated on the western edge of the Brecon Beacons in southwest Wales. This region is characterized by glacial lakes, high peaks, and striking escarpments within the Bannau Brycheiniog National Park. The landscape offers a combination of rolling countryside, caves, waterfalls, and mountain plateaus. These sites are notable for their natural features and connection to Welsh folklore.
Last updated: May 3, 2026
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Herbert’s Quarry is part of the Black Mountain and Mynydd Myddfai Registered Landscape of Outstanding Historic Interest in Wales. Unlike in other lime producing areas where canals and tramroads could be built, the industry at Herbert’s Quarry was served solely by road transport. The lime trade was a factor in the development of Turnpike roads, and the network of tracks and roads over the mountain is closely associated with the activity at Herbert’s Quarry. As you walk through the site you are taking a journey through time, and walking in the footsteps of many hundreds and thousands of people before you, people whose hard work, sweat and drudgery shaped this landscape and left a rich industrial legacy.
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The views down onto Llyn Y Fawr from here is pretty spectacular. This is one of the nicest places in the Brecon Beacons to walk along. Once you have put in the effort to get here, the ridge has a good footpath, there's a nice walled shelter and the views down towards the lake is pretty awesome on a good day.
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Ahhhh Llyn Y Fan Fawr, this glaciated lake is about the nicest place you can be on a hot summers day or even a cold winter's morning. It has been central to my working life in the hills for nearly forty years. It is just so perfectly locacted and makes for a good check point with groups, a rest spot, a camping spot and a perfect wild swimming spot on a hot day. Don't listen to the naysayers, this has been an iconic wild swimming spot for eons. Apart from that it will be a tad cold, it is just about one of the best swim spots in the Brecon Beacons.
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A quieter route that leads to the lake. Beautiful and challenging. ideal for all weathers.
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Fan Brycheiniog is the highest peak at a height of 802.5 metres in the Black Mountain region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on the edge of the escarpment, and nearby, a stone shelter with an inner seat.
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Fan Brycheiniog is the highest peak at a height of 802.5 metres in the Black Mountain region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on the edge of the escarpment, and nearby, a stone shelter with an inner seat.
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Llyn y Fan Fawr is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, the highest peak of the Black Mountain range within the Brecon Beacons National Park. Created as a result of glacial action, it is one of the largest glacial lakes in southern Wales. The lake is roughly rectangular in shape with its long axis oriented roughly north–south.
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The region around Myddfai, nestled in the Brecon Beacons, is rich in natural beauty. You can explore stunning glacial lakes like Llyn y Fan Fach, famous for its serene waters and folklore, and Llyn y Fan Fawr. The area also boasts high peaks such as Fan Brycheiniog, the highest point in the Black Mountain range, and Picws Du, both offering incredible panoramic views.
Yes, the Myddfai area offers several challenging hikes, particularly along the escarpments of the Black Mountain range. The ascent to Fan Brycheiniog summit provides excellent ridge walking opportunities with breathtaking landscapes. Similarly, reaching Picws Du summit involves a challenging climb but rewards hikers with amazing views across the lakes and valley.
For a relatively easy walk, consider the lower slopes of Mynydd Myddfai. While not listed as a highlight in the guide, this area offers accessible paths and fantastic views of the Towy valley and surrounding mountains, making it a magical walk for various fitness levels. Additionally, Llyn y Fan Fach is reachable within a short walking distance from its car park, though it involves an uphill slog.
The natural monuments around Myddfai are beautiful year-round, but each season offers a different experience. Spring and summer provide lush green landscapes and warmer temperatures, ideal for hiking and enjoying the lakes. Autumn brings vibrant colors to the moorlands. For stargazing, the area's dark sky status makes it exceptional on clear nights, particularly outside of summer months when nights are longer.
Many trails and natural areas around Myddfai are dog-friendly, but it's essential to keep dogs under control, especially due to livestock grazing and ground-nesting birds. Always follow the Countryside Code, keep dogs on a lead where required, and clean up after them. Specific rules may apply in certain protected areas, so check local signage.
While many trails can be challenging, the short walk to Llyn y Fan Fach from its car park can be a rewarding family outing, offering beautiful scenery and the allure of the Lady of the Lake legend. The lower slopes of Mynydd Myddfai also provide accessible paths suitable for families looking for a less strenuous ramble with great views.
The remote and untouched landscape around Myddfai's natural monuments is excellent for wildlife spotting. Near Picws Du, you may have the opportunity to see various bird species, including red kites, common buzzards, kestrels, carrion crows, common ravens, and skylarks. The moorlands and lakes also support diverse flora and fauna.
Yes, Herbert's Quarry, also known as Black Mountain Quarry, is a significant historical site within the natural landscape. It ceased operation in the late 1950s, and its ruins and spoil heaps tell the story of 200 years of lime burning and its impact on the region's industrial legacy and the development of local road networks.
Yes, wild swimming is possible in some of the lakes. Llyn y Fan Fawr is noted as an iconic wild swimming spot, perfect for a refreshing dip on a hot day, though be prepared for cold water. Always exercise caution, be aware of water conditions, and prioritize safety when wild swimming.
Access to the natural monuments typically involves driving to designated car parks, such as the one for Llyn y Fan Fach. Be aware that car parks can be small and get busy, especially during peak times. Roads leading to these areas can also be narrow, so drive slowly and carefully. Public transport options are limited in this remote area, so a car is generally recommended.
Beyond hiking, the Myddfai area offers various outdoor activities. You can find excellent running trails, such as the Usk Reservoir running loop, and mountain biking routes like the Usk Reservoir and Glasfynydd Forest loop. Road cycling is also popular, with challenging routes like the Black Mountain, Devil's Elbow & Usk Reservoir loop. For more details on these activities, explore the running trails, MTB trails, and road cycling routes guides around Myddfai.
The natural monuments around Myddfai are unique due to their compelling blend of majestic glacial landscapes, opportunities for diverse outdoor activities, and a rich tapestry of Welsh folklore. Sites like Llyn y Fan Fach are deeply intertwined with the legend of the Lady of the Lake, adding a layer of enchantment to the natural beauty. The region's status as a dark sky area also offers exceptional stargazing opportunities.
The views from the peaks in the Myddfai area are truly spectacular. From the summit of Fan Brycheiniog, you can enjoy amazing panoramic vistas over the rugged landscape, including the glacial lakes below. Similarly, Picws Du offers incredible views across Llyn y Fan Fach and the surrounding valley, making the challenging ascent well worth the effort.


Extend your search for the best caves by checking out these guides of the top ones around Myddfai: