4.5
(502)
9,242
hikers
557
hikes
Hikes around Old St Mellons explore the area's mix of rural countryside and suburban green spaces on the eastern edge of Cardiff. The terrain is generally low-lying, characterized by walks along river valleys like the Rhymney and around local lakes. Many routes follow well-defined paths through parks and nature reserves, making the region accessible for various fitness levels.
Last updated: May 12, 2026
12
hikers
4.77km
01:15
30m
30m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5.0
(6)
11
hikers
7.66km
01:57
20m
20m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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7
hikers
6.19km
01:38
50m
50m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
6
hikers
3.19km
00:48
0m
0m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
2
hikers
15.4km
04:08
190m
190m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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Stunning little lake with a nice path going round it. Some nice views in particular from the Eastern point where a winding bridge gives the best sight across the whole lake
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Great place to walk. So much wildlife too see around the lake and beyond
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Ruperra Castle or Rhiwperra Castle (Welsh: Castell Rhiw'r Perrai) is a Grade II* Listed building and Scheduled Ancient Monument, situated in Lower Machen in the county borough of Caerphilly, Wales. Built in 1626, the castle is in a ruinous condition as at 2023. Its grounds are listed on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.
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multiple well kept trails around the woodlands , but don't go cycling around the reservoir as I found out there is no cycling, even though there are no signs , i got abuse from aggressive walkers about it.
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Whatever you do is don't cycle around the reservoir, got told off and abusively shouted at.
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Yes, many of the trails in the area are circular, making it easy to start and end your hike in the same place. A great example is the Hendre Lake – Hendre Lake loop from Marshfield, which is a gentle, mostly flat walk around the lake, perfect for a relaxed outing.
Old St Mellons is generally a good area for dog walking, with many parks and open spaces. Hendre Lake Park and Parc Tredelerch are popular spots with locals for walking dogs. However, some routes may pass through farmland with livestock or near roads, so it's always best to keep your dog on a lead where required.
Absolutely. The region is well-suited for families, offering many flat and accessible paths. The Boardwalk Through Reeds loop from Rumney is a great option, providing an easy walk through parkland that is manageable for little legs.
Yes, you can plan a hike that includes a stop for refreshments. For a longer walk that incorporates a pub, consider the Y Maerun Pub & Dining loop from Marshfield. This moderate route allows you to enjoy the countryside before or after a well-earned break.
The terrain is generally low-lying and not overly strenuous. You'll mostly find well-defined paths along river valleys, like the Rhymney, and through local parks. While most routes are flat, some trails, such as the Rhymney River Circular Walk, feature short climbs through woodland sections.
The area is rich in natural beauty. Hendre Lake Park is a designated Site of Special Scientific Interest, known for its birdwatching opportunities and wildflowers. For a different experience, Cath Cobb Woods is an ancient woodland that offers a glimpse into a complex ecosystem with plants like bluebells and wood anemone, especially beautiful in the spring.
There is a wide variety of options to explore, with over 500 hiking routes in the region. These range from short, easy strolls to more challenging moderate hikes, ensuring there's a trail for every ability level.
The trails are highly regarded by the komoot community, with an average rating of 4.6 stars. Hikers often praise the peaceful riverside paths and the well-maintained trails through the area's green spaces and nature reserves.
Yes, the region has a rich history. The village core of Old St Mellons is a Conservation Area, reflecting its past as a coaching stop on a road used since Roman times. On some longer walks, you can also spot historic landmarks like Ruperra Castle in the distance.
Yes, many of the trails are accessible via public transport. Several bus routes from Cardiff city centre serve the Old St Mellons, Rumney, and Pontprennau areas, putting you within walking distance of trailheads for routes like the Hiking loop from Pontprennau.
Parking is available at several of the main parks. Both Hendre Lake Park and Parc Tredelerch offer free parking, making them convenient starting points for many walks. For other routes, on-street parking may be available, but always check local restrictions.
You can enjoy hiking here year-round, but spring and summer are particularly lovely. In spring, woodlands like Cath Cobb Woods are filled with bluebells and other wildflowers. Summer offers long, pleasant days perfect for exploring the riverside paths and parks.


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