Best lakes around Old St Mellons are primarily centered around Hendre Lake, a significant natural feature within Hendre Lake Park. This area is part of the Gwent Levels, recognized for its diverse ecosystem and natural beauty. The region offers various man-made lakes and reservoirs, providing opportunities for outdoor activities and wildlife observation. These water bodies contribute to the local landscape, offering accessible natural spaces for residents and visitors.
Last updated: August 24, 2026
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The Barrage connects Penarth to the Cardiff peninsula. It offers stunning views across the sea to one side, and the freshwater bay on the other. One of the highlights of the Cardiff Bay tour
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Every day, this narrow crossing offers a new perspective on life. It's a unique place where you feel enveloped in blue. Love it!
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Cardiff Bay Barrage is a significant engineering project located in Cardiff, Wales. Completed in 1999, the barrage was built to create a freshwater lake in Cardiff Bay by damming the River Taff and the River Ely. This project transformed the bay area, which was previously a tidal estuary, into a more controlled water environment. Key Features and Purpose: Tidal Control: The barrage helps manage tidal flows, preventing flooding and allowing for the creation of a stable freshwater environment. Recreation and Tourism: The area around the barrage has been developed for recreational use, including walking and cycling paths, boating, and various leisure activities. It has become a popular destination for both locals and tourists. Environmental Impact: The construction of the barrage altered the local ecosystem. While it created new habitats in the freshwater lake, it also raised concerns about the impact on marine life in the estuary. Hydropower Generation: The barrage includes a small power station that harnesses tidal energy, contributing to renewable energy production. Economic Development: The project played a crucial role in the regeneration of Cardiff Bay, leading to significant investment and development in the area, including residential, commercial, and cultural projects. The Cardiff Bay Barrage is often noted for its engineering complexity and its role in transforming the landscape and economy of Cardiff.
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Lisvane and Llanishen Reservoirs forms a vital part of the green and blue infrastructure of Cardiff. The mix of grassland, woodland, scrub and waterside habitats offers opportunities for all kinds of wildlife and nature. There are two Sites of Special Scientific Interest (SSSI) and much of the grassland and woodland outside of the SSSIs is designated as a Site of Importance for Nature Conservation (SINC). Dogs are permitted on the café balcony, car park and Grab & Go seating area only and are not permitted anywhere else on the site, including the paths. Natural Resources Wales has advised that the risk from dogs to the fungi is too great. Waxcaps are very sensitive to changes in habitat such as fluctuations in soil moisture, temperature and nitrate levels which can reduce the production of fruiting bodies. In particular, sudden changes to nitrate levels on the site – from dog urine specifically – can have a detrimental effect on the fungi. There is a fully accessible Visitor Centre with cafe, toilets, free wi-fi, room hire, equipment hire, changing rooms and other facilities include the boathouse, bird hide, education centre, nature trails and paths, bike parking/shelters and car parking.
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Enjoy a pretty stroll through the woodland surrounding Llanishen Reservoir. Well-maintained dirt paths will lead you around the forest where there is a rope swing and stream to discover, a little something for the kids to enjoy too.
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Roath Park is one of Cardiff's most loved parks, it was recently awarded the prestigious Green Flag award to recognise its high quality and its importance to Cardiff. In the centre of the park sits the wonderful Roath Lake, a peaceful place to walk around with sights of ducks, birds, and an impressive lighthouse stood in the water. There is a lovely little café and plenty of places to picnic, so take a seat and enjoy the view.
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Cardiff Bay Barrage was completed in 1999, following a huge construction project. Stretching from Cardiff Docks to Penarth, the barrage impounds freshwater from the rivers Ely and Taff to create a large freshwater lake, providing permanent high water.
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Good place for a stroll or poodle on the bike. Decent section of the Bay cycle path for younger riders.
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The primary natural feature is Hendre Lake, located within Hendre Lake Park. Other notable water bodies include the man-made Cardiff Bay Barrage, which creates a large freshwater lake, and Roath Park Lake, known for its peaceful walks and impressive lighthouse. You can also explore the area around Lisvane and Llanishen Reservoirs.
Yes, several lakes are great for families. Cardiff Bay Barrage offers recreational paths for walking and cycling. Roath Park Lake is a popular spot with ducks, birds, and picnic areas. Additionally, Rhydypenau Woods and Llanishen Reservoir features woodland trails with a rope swing and stream, perfect for kids.
Hendre Lake, being part of the Gwent Levels, is excellent for birdwatching, with sightings of buzzards, herons, moorhens, swans, and mallards. The area around Lisvane and Llanishen Reservoirs also supports a variety of wildlife and plant species across its grassland, woodland, and waterside habitats, including two Sites of Special Scientific Interest (SSSI).
Yes, Lisvane and Llanishen Reservoirs offers a fully accessible Visitor Centre and nature trails. The paths around Hendre Lake are also well-maintained and suitable for walking.
Hendre Lake Park is a popular spot for dog walkers, with an 800-meter path encircling the lake. However, at Lisvane and Llanishen Reservoirs, dogs are permitted only on the café balcony, car park, and Grab & Go seating area, and are not allowed on the paths due to the risk to sensitive fungi.
Hendre Lake Park provides seating areas and a free car park. Lisvane and Llanishen Reservoirs features a fully accessible Visitor Centre with a cafe, toilets, free Wi-Fi, room hire, equipment hire, changing rooms, a boathouse, bird hide, and bike parking. Roath Park Lake also has a lovely café and picnic spots.
Beyond walking and birdwatching at the lakes themselves, the region offers various cycling opportunities. You can find mountain biking trails in the area, such as the 'Blackweir Footbridge – View of Castell Coch loop from Cathays' or 'Old Quarry – Woodland Trail loop from Machen'. For road cycling, consider routes like 'West Side of Cardiff Bay – Cardiff Bay Barrage loop from Pentwyn'. There are also gravel biking options, including the 'Caerphilly mountain loop from Cardiff'. You can explore more routes on the MTB Trails around Old St Mellons, Road Cycling Routes around Old St Mellons, and Gravel biking around Old St Mellons guide pages.
Yes, fishing is a notable activity at Hendre Lake. It is a large, well-stocked lake, and fishing platforms are available for use without prior booking.
Hendre Lake was created in the 1970s with the primary purpose of helping to protect new housing developments in St Mellons from flooding.
The Cardiff Bay Barrage is a significant engineering project completed in 1999. It impounds freshwater from the rivers Ely and Taff to create a large freshwater lake, transforming the bay area into a controlled water environment. It plays a crucial role in tidal control, flood prevention, and has contributed to the regeneration and development of Cardiff Bay.
Yes, Roath Park Lake has a lovely café. Additionally, Lisvane and Llanishen Reservoirs features a Visitor Centre with a cafe and Grab & Go seating.
The area around Lisvane and Llanishen Reservoirs is recognized for its rich biodiversity. It forms a vital part of Cardiff's green and blue infrastructure, featuring a mix of grassland, woodland, scrub, and waterside habitats. It includes two Sites of Special Scientific Interest (SSSI) and a Site of Importance for Nature Conservation (SINC), offering opportunities to observe various wildlife and plant species.


Still not found your perfect lake around Old St Mellons? Check out the guides of these regions to see even more beautiful places.