Llwyn-on Reservoir: A Tranquil Welsh Water Haven in the Brecon Beacons
Discover the largest reservoir in the Taf Fawr valley, a peaceful retreat with scenic walks, rich wildlife, and historic charm in the Brecon Beacons.
Llwyn-on Reservoir, the largest in the Taf Fawr valley near Merthyr Tydfil, is a serene water body nestled within the Brecon Beacons National Park. Built in the early 20th century to supply water to Cardiff, it offers scenic walking trails, abundant wildlife, and peaceful picnic spots, making it a perfect retreat for nature lovers and anglers alike.
A brief summary to Llwyn-on Reservoir
- Merthyr Tydfil, GB
- Duration: 1 to 3 hours
- Free
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Outdoor
- Mobile reception: 4 out of 5
Local tips
- Visit during dry spells to see the ancient Pont ar Daf bridge emerge from the water—a unique photo opportunity.
- Bring fishing gear and purchase a day ticket if you want to fish for rainbow or wild brown trout.
- Use the Garwnant Visitor Centre for toilets, refreshments, and to learn more about the local environment.
- Wear sturdy shoes for the 5 km walking loop, which includes some uneven and gently inclined terrain.
- Respect the no swimming and no canoeing rules to help maintain water quality and wildlife habitats.
For the on-the-go comforts that matter to you
- Restrooms
- Food Options
- Seating Areas
- Picnic Areas
- Information Boards
Getting There
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Car
Driving from Merthyr Tydfil town center takes about 15–20 minutes via the A470. Parking is available near the Garwnant Visitor Centre free of charge. Note that road conditions can be narrow and winding, so drive cautiously.
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Bus
Local bus services connect Merthyr Tydfil with stops near the reservoir along the A470. Travel times range from 25 to 40 minutes depending on the route. Check current timetables as frequency varies, especially on weekends.
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Walking
For active visitors, a moderate 1.5 to 2-hour hike from Merthyr Tydfil town center is possible via public footpaths and trails. Terrain includes some uneven and gently inclined sections, suitable for experienced walkers.
Llwyn-on Reservoir location weather suitability
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Any Weather
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Rain / Wet Weather
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Clear Skies
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Mild Temperatures
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Cold Weather
Discover more about Llwyn-on Reservoir
Historic Origins and Engineering Marvel
Llwyn-on Reservoir is the largest and southernmost of three reservoirs in the Taf Fawr valley, constructed between 1911 and the 1920s to augment Cardiff’s water supply. Authorized by the Cardiff Corporation Act of 1884, the reservoir was created by damming the River Taf Fawr about 6.4 km upstream from Merthyr Tydfil. The earthen dam’s construction began in 1911, with solid rock foundations reached by mid-year. The reservoir’s creation was part of a broader effort to provide clean water and compensation flows to the river, balancing human needs with environmental stewardship. Since 1973, Welsh Water has managed the reservoir, ensuring its role in regional water supply and conservation.Natural Setting within the Brecon Beacons
Situated within the protected Brecon Beacons National Park, Llwyn-on Reservoir straddles the Merthyr Tydfil and Rhondda Cynon Taf unitary authority areas. The reservoir covers approximately 150 acres, surrounded by mixed woodlands and upland terrain. The landscape features a peaceful conifer plantation planted soon after the reservoir’s completion to prevent soil erosion. Visitors can enjoy expansive views of the water framed by the park’s rolling hills, with the A470 road running along the eastern shore, providing easy access while maintaining the area’s tranquil atmosphere.Recreational Opportunities and Wildlife
Llwyn-on Reservoir is a favored spot for anglers, stocked with rainbow trout and supporting wild brown trout populations. Fly fishing, spinning, and worming are permitted with day tickets controlled by Welsh Water. The reservoir’s clean waters also support diverse wildlife, including otters, great crested grebes, goldeneye ducks, goosanders, and coots. Walking trails around the reservoir offer a 5 km loop with a mix of flat and gently inclined terrain, suitable for most visitors. Picnic tables and benches are scattered along the shore, complemented by nearby facilities at the Garwnant Visitor Centre, which offers toilets, a café, and outdoor sculptures.Unique Features and Seasonal Changes
One of Llwyn-on Reservoir’s most captivating features is the Pont ar Daf bridge, an ancient structure that emerges from the water during dry spells, creating a striking photographic opportunity. The reservoir’s water levels fluctuate seasonally, influenced by rainfall patterns, which alters the landscape and wildlife activity. This dynamic environment invites repeated visits to witness the changing vistas and to experience the peaceful ambiance throughout the year.Community and Conservation Efforts
The reservoir’s surroundings reflect a balance between human utility and nature conservation. The forested areas were deliberately planted to protect water quality and prevent soil runoff. Conservation efforts have fostered habitats for various species, enhancing biodiversity within the national park. Interpretive panels and a poetry stone along walking routes offer insights into the reservoir’s history and ecological significance, enriching the visitor experience with cultural and environmental context.Accessibility and Visitor Experience
Accessible year-round, Llwyn-on Reservoir welcomes visitors seeking relaxation, outdoor exercise, and wildlife observation. The well-maintained paths and facilities cater to families, anglers, and casual walkers. The nearby Garwnant Visitor Centre serves as a hub for amenities and information. While swimming and canoeing are prohibited to protect water quality, the reservoir’s scenic beauty and tranquil setting provide a rewarding destination for day trips and nature escapes.Iconic landmarks you can’t miss
YHA Brecon Beacons
11.0 km
Rustic farmhouse hostel offering clean, cozy accommodation and a warm communal atmosphere in the heart of Brecon Beacons National Park.
Brecon Canal Basin
16.7 km
Breathe in the beauty of Brecon Canal Basin, a serene escape in Wales perfect for leisurely walks, local cuisine, and outdoor adventures amidst stunning landscapes.
Brecon Barracks
16.7 km
Historic military hub in Brecon, home to the Royal Welsh Regiment and its museum, set within the stunning Brecon Beacons National Park.
The Royal Welsh Regimental Museum
16.8 km
Explore the Royal Welsh Regimental Museum in Brecon, where Wales' military history comes alive through captivating exhibits and rich heritage.
Brynich Lock
16.8 km
Experience the serene beauty of Brynich Lock, a tranquil spot along the Brecon & Monmouthshire Canal, perfect for nature lovers and peaceful escapes.
Cefn Llechid
16.8 km
Explore Cefn Llechid in Brecon Beacons National Park for breathtaking views, outdoor adventures, and a rich tapestry of history.
Y Gaer Museum, Art Gallery & Library
16.9 km
Explore Y Gaer Museum, Art Gallery & Library in Brecon for an enriching experience of local history, art, and literature in a cultural landmark.
Brynich Aqueduct
16.9 km
Historic stone aqueduct carrying the Monmouthshire and Brecon Canal over the River Usk, showcasing early 19th-century engineering and scenic beauty.
Duke of Wellington Monument
16.9 km
Historic bronze statue honoring the Duke of Wellington, a commanding presence in Brecon’s town centre and a testament to local artistry and British heritage.
Brecon Town Tours - guided history walks
16.9 km
Experience the rich history of Brecon with guided tours that unveil the town's hidden gems and captivating stories in the heart of the Brecon Beacons.
Gate Gallery & Glassworks
17.0 km
Discover the artistic beauty of handmade glassware at Gate Gallery & Glassworks in Brecon, where craftsmanship meets creativity.
The Promenade
17.0 km
Discover tranquility and natural beauty at The Promenade in Brecon, a perfect park to unwind and enjoy the stunning Welsh landscape.
Visit Brecon
17.0 km
Explore the beauty of Brecon, a quaint Welsh town that serves as the gateway to the stunning Brecon Beacons National Park.
Craig-y-Nos Country Park
17.0 km
Explore the enchanting landscapes and rich history of Craig-y-Nos Country Park, a perfect retreat in the Brecon Beacons for nature lovers and adventure seekers.
The Brecon Castle Hotel
17.1 km
Historic Wales’ oldest hotel blending timeless charm with modern comforts near Brecon Beacons National Park.
Unmissable attractions to see
Cadair Fawr
2.9 km
Accessible mountain views across South Wales' rolling landscape, perfect for all abilities.
Castell Morlais 'Morlais Castle'
4.9 km
Explore the evocative ruins of 13th-century Castell Morlais, perched above Merthyr Tydfil with panoramic views and rich medieval history.
Brecon Mountain Railway
5.7 km
Experience the magic of steam through the breathtaking Brecon Beacons on a historic heritage railway journey.
Twyn Mwyalchod
5.8 km
A steep yet rewarding trig point summit offering panoramic ridge views and poignant memorials in the heart of the Brecon Beacons.
Cyfarthfa Castle Museum and Art Gallery
5.8 km
Explore the grand industrial heritage and art treasures of Cyfarthfa Castle, a majestic 19th-century ironmaster’s mansion set in expansive parkland.
Penderyn Brecon Beacons Distillery - Visitor Centre and Shop
6.7 km
Discover the home of Welsh whisky in the Brecon Beacons – tour the original Penderyn Distillery, see the Faraday still, and taste award-winning single malts.
St Tydfil Shopping Centre
7.2 km
Merthyr Tydfil’s premier shopping centre offering a modern, accessible retail experience with over 50 shops and ample parking in the town heart.
Bannau Brycheiniog National Park (Brecon Beacons)
7.3 km
Explore Wales’ breathtaking Bannau Brycheiniog National Park, where majestic peaks, cascading waterfalls, and rich heritage await every adventurer.
Porth yr Ogof
7.9 km
Explore Wales’ largest cave entrance, a thrilling limestone labyrinth carved by the Afon Mellte in the heart of Brecon Beacons National Park.
Sgwd Yr Eira Waterfall
8.0 km
Walk behind the stunning 50-foot curtain of water at Sgwd yr Eira, the enchanting Waterfall of Snow in Wales’ Brecon Beacons.
National Trust - Brecon Beacons
8.1 km
Explore Pen y Fan and the Brecon Beacons from Pont ar Daf, where nature, adventure, and modern facilities meet in Wales’ iconic mountain park.
Four Waterfalls Walk
8.1 km
Discover the enchanting Four Waterfalls Walk, a scenic 9 km trail through ancient woodland and cascading falls in Wales’ Brecon Beacons National Park.
Fan Fawr
8.2 km
Fan Fawr: A majestic peak in Wales’ Brecon Beacons, blending stunning glacial landscapes with rich geology and timeless Welsh legends.
Pen-y-Fan walk carpark
8.2 km
Primary access point for hiking Pen y Fan, South Wales’ highest peak, nestled in the scenic Brecon Beacons National Park.
Sgwd Clun-Gwyn Waterfall
8.3 km
Discover the cascading beauty of Sgwd Clun-Gwyn, a serene multi-step waterfall nestled in the lush woodlands of South Wales’ Brecon Beacons.
Essential places to dine
Aberglais Inn
4.3 km
Cozy pub and restaurant in Merthyr Tydfil offering hearty British classics, vegan and gluten-free options, with a warm, friendly atmosphere.
Mango House Restaurant
4.7 km
Experience authentic Indian cuisine with warm hospitality in the heart of Merthyr Tydfil’s Cefn-coed-y-cymmer.
Red Cow Inn
5.1 km
A charming traditional Welsh pub in Pontsticill offering hearty home-cooked meals, award-winning ales, and a warm, welcoming atmosphere.
The Pantyscallog Inn
6.5 km
A beloved steakhouse in Pant, Merthyr Tydfil, known for hearty portions, friendly service, and a warm, welcoming atmosphere.
The Red Lion Inn, Penderyn
7.1 km
A cozy Welsh gastropub blending traditional charm, local flavors, and legendary roasts in the scenic village of Penderyn.
Rhydycar Harvester
7.8 km
Casual family dining with classic British flavors and welcoming amenities in Merthyr Tydfil’s Rhydycar Leisure Park.
Pentrebach House Table Table
9.8 km
Classic British pub dining with family-friendly charm and hearty meals in the heart of Merthyr Tydfil.
The Farmers Arms
10.9 km
Historic farmhouse pub in Rhymney offering scratch-cooked Welsh cuisine, a full bar, and a warm, welcoming atmosphere for all occasions.
The Tai’r Bull Inn
14.1 km
A cosy Welsh country pub and B&B offering hearty fare, real ales, and warm hospitality in the heart of Brecon Beacons National Park.
The White Hart
15.0 km
Traditional Welsh inn in Talybont-on-Usk offering hearty British fare, local ales, and warm hospitality near the Brecon Beacons.
Travellers Rest Inn
15.2 km
Cozy countryside inn with hearty meals and warm hospitality near the scenic Brecon Beacons.
Carnivore By The Mine
15.4 km
A cozy meat-lover’s haven in Neath, blending hearty dishes with heartfelt mining heritage and warm local charm.
Penycae Inn Ltd
16.3 km
Cozy gastropub in the heart of South Wales offering fine Welsh cuisine, scenic mountain views, and a unique family-friendly atmosphere.
The Red Lion
16.6 km
A historic Welsh village pub blending centuries-old charm with warm hospitality and local brews in the heart of Llangynidr.
Gorkha & Khukuri
16.6 km
Savor authentic Nepalese cuisine in a serene Brecon setting, where tradition and flavor unite at Gorkha & Khukuri.
Markets, malls and hidden boutiques
Izzy Roo's
13.7 km
Explore Izzy Roo's in Tredegar for unique gifts and local crafts, capturing the essence of the region's charm and creativity.
Gwent Shopping Centre
13.7 km
A vibrant retail hub in Tredegar offering diverse shops, convenient hours, and a welcoming community atmosphere.
The UK Loose Leaf Tea Company Ltd
16.0 km
Discover ethically sourced, premium loose leaf teas and sustainable brewing essentials at The UK Loose Leaf Tea Company Ltd in Brecon.
KM Gifts & Accessories
16.2 km
Discover quality gifts, stylish accessories, and friendly service at KM Gifts & Accessories in the heart of Ebbw Vale.
Hay & Brecon Farmers Brecon
16.2 km
Experience the best of local Welsh produce at Hay & Brecon Farmers Brecon, where freshness and quality meet a warm community spirit.
Mind
16.3 km
Explore unique finds and support mental health initiatives at Mind Charity Shop in Brecon, where every purchase makes a difference.
B&M Home Store with Garden Centre
16.4 km
Affordable shopping meets gardening passion at Brecon’s versatile B&M Home Store with Garden Centre.
CERTAS - BRECON
16.6 km
Discover convenience in Brecon with CERTAS, your one-stop shop for essentials, local treats, and friendly service.
DIXIES CORNER
16.8 km
Brecon's trusted specialist in authentic military surplus and outdoor gear since establishment.
Beacons Antiques
16.9 km
Discover timeless vintage treasures and unique collectibles at Beacons Antiques, a charming hub of history in the heart of Brecon.
Kitty Keane's Vintage
16.9 km
Discover authentic Welsh vintage and handcrafted treasures at Kitty Keane's Vintage, a charming craft shop in the heart of Brecon.
Tŷ Cariad
16.9 km
Discover authentic Welsh crafts and unique gifts at Tŷ Cariad, Brecon’s cozy hub for local artistry and culture.
Get Connected
16.9 km
Explore Brecon with confidence, staying connected at Get Connected—the mobile shop for all your tech needs in the heart of the town.
The Vapour Den
16.9 km
Explore Brecon’s vibrant vaporizing culture at The Vapour Den, your friendly local shop for expert advice and quality vaporizers.
Premier
17.0 km
Your friendly, convenient stop for groceries and essentials in the heart of Brecon, open early to late every day.
Essential bars & hidden hideouts
The Star Inn
15.0 km
A cozy and characterful pub with quality food and a sunny beer garden in the heart of Talybont-on-Usk, perfect for walkers and families alike.
Royal Oak
15.6 km
Cozy Welsh pub in Pencelli offering traditional hospitality and local ales amidst the scenic Brecon Beacons.
Coach & Horses
15.9 km
Historic canal-side pub and inn in Llangynidr offering hearty Welsh fare, cozy rooms, and a warm, welcoming atmosphere.
Drovers Arms
16.5 km
A welcoming Welsh village pub blending historic charm with hearty fare and friendly hospitality in the heart of Llanfaes, Brecon.
The Three Horseshoes Inn
16.7 km
A cosy Welsh village pub blending traditional charm with refined British cuisine and a warm, welcoming atmosphere.
hop in beer and gin
16.8 km
Discover Brecon’s quirky bar with top-quality craft beers, artisanal gins, and delicious tapas in a cozy, historic setting.
The Rorkes Drift
16.9 km
Historic Welsh pub in Brecon offering local ales, lively music, and a warm atmosphere inspired by the legendary Rorke’s Drift battle.
Markets Tavern
17.0 km
Traditional Welsh pub and welcoming hotel in Brecon offering hearty food, cozy rooms, and authentic local charm on Free Street.
The Sarah Siddons
17.0 km
Experience authentic Welsh hospitality with local ales and lively atmosphere at The Sarah Siddons, Brecon’s beloved town centre pub.
The Lounge Bar & Cafe
17.1 km
Brecon’s pioneering bar with a modern twist, offering signature cocktails, live music, and a welcoming atmosphere in the town centre.
The New Inn
17.3 km
A cozy, affordable pub and backpackers’ haven in Bwlch, offering hearty food, friendly service, and a welcoming base for exploring the Brecon Beacons.
Lakeside Bar
19.5 km
Relax lakeside at this friendly pub within Brecon’s scenic caravan park, perfect for unwinding after exploring the Brecon Beacons.
The Red Lion Llangorse
20.1 km
A welcoming Welsh gastropub in Llangorse offering seasonal local dishes, real fires, and a cozy atmosphere near the Brecon Beacons.
Jolly Colliers
21.6 km
A cozy, friendly pub in Llanelly Hill offering hearty British fare and rustic tapas in a charming countryside setting.
The Pwllgloyw Arms
21.7 km
A cozy mountain pub in Powys offering hearty Welsh fare, local ales, and a warm, welcoming atmosphere year-round.
Nightclubs & after hour spots
The Kirkhouse Nightclub (Koolers)
6.9 km
Experience the vibrant and friendly nightlife of Merthyr Tydfil at The Kirkhouse Nightclub, known locally as Koolers.
Pure Bar & Nightclub Ltd
7.1 km
A lively nightclub and cocktail bar in Merthyr Tydfil offering vibrant music, crafted drinks, and late-night entertainment in South Wales.
Northcote Conservative Club
16.9 km
Discover the lively ambiance of Northcote Conservative Club, Brecon's premier destination for nightlife, music, and local culture.
Brecon Jazz Club (Muse Arts Centre)
17.0 km
Discover the heart of jazz in Brecon at the Brecon Jazz Club, where live music and a vibrant atmosphere collide for an unforgettable night.
BRECON JAZZ
17.0 km
Experience the soulful sounds of Brecon Jazz, an intimate venue celebrating the rich heritage of jazz music in the heart of Wales.
Brecon Working Mens Club
17.0 km
Experience authentic Welsh hospitality at Brecon Working Mens Club, where locals gather for drinks and camaraderie in a charming setting.
Squares Night club
20.8 km
Experience Porth’s vibrant nightlife at Squares Nightclub, where music, dance, and unforgettable evenings come alive every weekend.
The Top Club
21.7 km
Experience Blaengarw’s vibrant nightlife at The Top Club, where electrifying entertainment meets community spirit in the heart of South Wales.
Eclipse Nightclub
24.6 km
Experience Pontypridd’s vibrant midweek nightlife at Eclipse Nightclub, where music, dancing, and community come alive every Wednesday night.
The Arch Bar & Nightclub
29.4 km
A lively Neath hotspot blending nightclub energy, live music, pub charm, and Thai cuisine in one vibrant venue.
Jimmy's Bar
32.7 km
Experience the vibrant nightlife and live music scene at Jimmy's Bar, Port Talbot’s lively local hotspot with a welcoming atmosphere.
Mojos
38.4 km
Discover the vibrant nightlife of Newport at Mojos, the go-to cocktail bar for creative drinks and nightly karaoke excitement.
Vibez
38.4 km
Experience Newport’s vibrant nightlife at Vibez Superclub, where pounding bass and late-night energy create unforgettable weekend parties.
Hush Newport
38.5 km
Experience the vibrant Saturday nightlife at Hush Newport, Baneswell’s hotspot for music, dancing, and late-night fun in the heart of Newport.
Stow Hill Rooms
38.6 km
A stylish Art Deco nightclub and function venue in the heart of Newport, blending vibrant nightlife with versatile event spaces.
For the vibe & atmosphere seeker
- Relaxing
- Tranquil
- Scenic
- Fun-filled
- Unique
For the design and aesthetic lover
- Rustic Designs
For the architecture buff
- Historic
- Parks & Gardens
For the view chaser and sunset hunter
- Iconic Views
- Panoramas
- Waterfront
- Sunset Spots
For the social media creator & influencer
- Instagrammable
- Photo Spots
- Selfie Spots
- Aesthetic Corners
For the eco-conscious traveler
- Protected Area
- Nature Reserve
- Public-Transport Accessible
- Locally Managed
- Wildlife Habitat
For the kind of experience you’re after
- Cultural Heritage
- Nature Escape
- Day Trip
- Weekend Getaway
- Photowalk
For how adventurous you want the journey to be
- Easy Access
- Requires Hike
Location Audience
- Family Friendly
- Senior Friendly
- Child Friendly
- Teen Friendly
- Wheelchair Access
- Pet Friendly
- Solo Friendly
- Couple Friendly
