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Merthyr Tydfil

Top 3 Lakes around Merthyr Tydfil

Best lakes around Merthyr Tydfil are found in South Wales, an area known for its natural landscapes and outdoor activities. The region features several reservoirs and lakes, many of which were originally built to supply water to the South Wales Valleys. These bodies of water are set amidst hills and forests, providing habitats for wildlife and offering recreational opportunities. Merthyr Tydfil's lakes are popular destinations for those seeking walking trails, fishing, and water-based activities.

Best lakes around Merthyr Tydfil

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Last updated: April 30, 2026

Pontsticill Reservoir

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Pontsticill Reservoir is a great location for its scenic beauty and because it is the start of many hiking and biking trails. There is a nice trail that actually goes …

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Llwyn-on Reservoir Dam

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Llwyn-on reservoir, built in 1926, covers 150 acres and is the largest of the three in the Taff Fawr Valleys area. Walking along the shore you can be immersed in …

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Pontsarn Blue Pool

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Blue Pool.
At the bridge, head downstream on the right bank, following the path, to reach the Pontsarn Blue Pool. The path can be followed as far as desired beyond …

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Taff Bargoed Country Park

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Taff Bargoed country park is made from what used to be 3 coal mines: Deep Navigation (1879-1991), Taff Merthyr (1926-1993), and Trelewis (1954-1993).

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Popular around Merthyr Tydfil

Lôn Las Cymru through Wales (NCR 8) – Ride from Holyhead to Cardiff

Wales's premium MTB destination — Bike Park Wales

Spectacular rides in Wales and south-west England – e-bike trials by Halfords

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Lôn Las Cymru through Wales (NCR 8) – Ride from Holyhead to Cardiff

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Jo
October 8, 2025, Pontsticill Reservoir

lovely . ( no phone signal ) bring yourself a drink and enjoy the view

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A visit is a must if you are nearby.

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Nice picturesque reservoir with a great campsite just below it if you are on a bike or hiking tour.

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Stunning view across the reservoir

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A very pretty and accessible dam, the spillover makes it a lovely scenic addition to your loop of the reservoir or the nearby forest. There are lovely picnic areas on the way around the dam, some eating spots by way of a roadside 'scoff' van in a nearby lay-by on the eastern shore, and the cafe at Garwnant Visitor Centre on the north side of the reservoir.

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The Pontsticill Reservoir is filled by the Taf Fechan via the Pentwyn Reservoir directly upstream. It was built by damming the valley and completed in 1927. The aim was to supply drinking water for the increasingly populated area to the south. You can loop the reservoir for a nice gentle run or follow the longer Taff Trail up the western shore.

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The beautiful Pontsticill Reservoir, originally Taff Fechan Reservoir, was opened in 1927 to supply water to much of the South Wales Valleys. The 110ft high embankment is holding back 15,400 megalitres of water.  It contains a bell-mouth overflow, which resembles a giant plughole.

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Adie
January 10, 2023, Llwyn-on Reservoir Dam

Llwyn-on reservoir, built in 1926, covers 150 acres and is the largest of the three in the Taff Fawr Valleys area. Walking along the shore you can be immersed in the fresh smells of the conifer forest and lapping sounds of the deep blue water - an ideal habitat for otters, great crested grebes, goldeneye, goosander and coot.

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Frequently Asked Questions

What types of outdoor activities are available around Merthyr Tydfil's lakes?

The lakes and reservoirs in Merthyr Tydfil offer a variety of outdoor activities. You can enjoy hiking, cycling, fishing, and water-based activities like canoeing, kayaking, and stand-up paddleboarding. For example, Pontsticill Reservoir is a popular spot for sailing and angling, while Pentwyn Reservoir (Dolygaer) offers water sports through an activity center. Many lakes also provide pleasant walking opportunities and picnic areas.

Are there family-friendly lakes in the Merthyr Tydfil area?

Yes, several lakes around Merthyr Tydfil are great for families. Pontsticill Reservoir and Llwyn-on Reservoir Dam are both noted as family-friendly. Cyfarthfa Park Lake, located within Cyfarthfa Park, also provides a recreational space with additional attractions like Cyfarthfa Castle, making it ideal for a family day out.

What are the best lakes for hiking and walking in Merthyr Tydfil?

For hiking and walking, Pontsticill Reservoir is an excellent choice, offering a scenic 6-mile (10km) circular hike. Llwyn-on Reservoir Dam also provides pleasant walking opportunities along its shores. You can find various hiking routes in the area, including easy loops like the Llwyn-on Reservoir loop.

Can I cycle around the lakes in Merthyr Tydfil?

Yes, cycling is a popular activity around Merthyr Tydfil's lakes. The Pontsticill Reservoir area is a starting point for many biking trails, and the West Shore Road offers a tarmac alternative for cyclists. The Taff Trail (NCN Route 8) also runs nearby Pentwyn Reservoir, providing accessible routes for cyclists. Explore more cycling options in the Cycling around Merthyr Tydfil guide.

What kind of wildlife can I expect to see at the reservoirs?

The reservoirs are rich in wildlife. Llwyn-on Reservoir Dam, for instance, is an ideal habitat for otters, great crested grebes, goldeneye, goosander, and coot. The fresh, clean water and surrounding conifer forests create a thriving environment for various species.

Are there any historical landmarks or features near the lakes?

Yes, the area around the lakes has historical significance. At Pontsticill Reservoir, the enigmatic ruins of the old Bethlehem Independent Chapel, submerged when the reservoir was created, can sometimes be seen during droughts. Pentwyn Reservoir is also set in a landscape with visible Iron Age hillforts and Bronze Age barrows, indicating a rich past.

Where can I go fishing around Merthyr Tydfil's lakes?

Fishing is a popular activity at several lakes. Pontsticill Reservoir is a popular spot for anglers. Llwyn-on Reservoir Dam is a favorite among anglers, particularly for fly, spinner, and worm fishing, and is regularly stocked with large trout. Cyfarthfa Park Lake is also accessible for fishing along the roadside, home to various fish species including Carp, bream, and roach.

Are there cafes or visitor centers near the lakes?

Yes, for refreshments, you can head to the Garwnant Visitor Centre, located on the north shore of Llwyn-on Reservoir Dam. There are also picnic areas available around the reservoirs for those who bring their own food. Cyfarthfa Park, home to Cyfarthfa Park Lake, also offers facilities.

What is the Brecon Mountain Railway and does it run near any lakes?

The Brecon Mountain Railway is a narrow-gauge steam railway that offers a unique way to experience the landscape. It runs alongside Pontsticill Reservoir, providing passengers with scenic views of the water and surrounding hills.

Can I do watersports like kayaking or paddleboarding on the lakes?

Yes, watersports are available on some lakes. Access for canoeing, kayaking, and stand-up paddleboarding is available at Pontsticill Reservoir and Pentwyn Reservoir (Dolygaer) through a Reservoir Passport Scheme. Pentwyn Reservoir is also adjacent to the Parkwood Outdoors Dolygaer activity center, which offers a range of water-based activities.

What is the Taff Trail and where does it connect to the lakes?

The Taff Trail is a long-distance multi-user path that runs through South Wales. It connects to the lakes area, with sections running near Pentwyn Reservoir, making it accessible for cyclists and walkers. You can also access the Taff Trail from areas near Pontsarn Blue Pool.

Are there any easy walking routes around the lakes for those seeking a gentle stroll?

Yes, there are several easy walking options. The 6-mile (10km) circular hike around Pontsticill Reservoir is considered an easy walk with beautiful views. Llwyn-on Reservoir Dam also offers pleasant and gentle walking paths along its shores. For more options, check out the Hiking around Merthyr Tydfil guide.

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