4.7
(48)
1,147
riders
47
rides
Mountain bike trails around St. Thomas offer a diverse landscape for exploration. The region features coastal paths along Swansea Bay, leading to areas like Mumbles Pier. Inland, routes explore reservoir areas and forest paths, providing varied terrain for mountain biking. Elevation changes are present, ranging from flatter coastal sections to more undulating inland trails.
Last updated: July 18, 2026
4.0
(1)
19
riders
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
2
riders
55.6km
03:32
520m
520m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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5.0
(1)
5
riders
24.7km
01:37
360m
360m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.0
(1)
13
riders
50.1km
02:47
340m
340m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(2)
11
riders
43.1km
02:20
210m
210m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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Lots of wide pavement around the water, wasn't too busy on a Sunday afternoon but I imagine it gets rammed with people sometimes.
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A lovely little cafe for a quick pit stop en route
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A nice pub along the trail. Great place to meet and finish a bike ride you get get coffee from the little van if it’s open or obvs a post ride pint 🍺
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The Marina is a great place to run. It is really flat and you can run past all the boats along the paths. The beach is close by and there are cafes and pubs that you can start or finish it. There's also public toilets there and there is a nice 5k loop or more
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Clyne Valley Country Park is a 691-acre (280-hectare) area set around the Clyne River that runs into the sea at the Mumbles seafront between Lower Sketty and Blackpill. It is a marvellous green area that covers both sides of the valley in thick woodlands of oak, birch, and beech trees. There are signs of its intensive industrial history dotted within the park, but mainly it is now noted for its extensive network of walking, running, and cycling trails.
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There are over 50 mountain bike trails around St. Thomas, offering a variety of experiences for different skill levels. The region features a mix of coastal paths, reservoir routes, and forested trails.
The trails in St. Thomas cater to a wide range of abilities. Approximately 16 routes are considered easy, 31 are moderate, and 3 are more challenging, ensuring options for beginners to experienced riders.
Yes, St. Thomas offers several easy mountain bike trails perfect for beginners. An example is the Swansea Marina – Swansea Bay loop from Llansamlet, which covers 17.2 miles (27.6 km) and offers relatively flat coastal riding.
Many trails in St. Thomas are moderate. For instance, the Lower Lliw Reservoir and Café – Upper Lliw Reservoir loop from Swansea is a popular moderate route, spanning 34.5 miles (55.6 km) and typically taking around 3 hours 32 minutes. Another option is the Swansea Bay – Mumbles Pier loop from Llansamlet, which is 26.3 miles (42.4 km) and takes about 2 hours 17 minutes.
While the majority of trails are easy to moderate, there are a few more challenging routes available. These often involve greater elevation changes and more technical sections, particularly in the inland reservoir and forest areas. You can filter for 'difficult' routes on komoot to find these.
Yes, many of the mountain bike routes in St. Thomas are designed as loops, allowing you to start and finish at the same point. Examples include the Lower Lliw Reservoir and Café – Lower Lliw Reservoir loop from Mynyddbach and the Forest Cycle Path – Forest Stream loop from Llansamlet.
Mountain bike trails in St. Thomas often pass by scenic points. You might encounter coastal views along Swansea Bay, leading towards Bracelet Bay and the Mumbles Lighthouse. Inland routes explore reservoir areas, and some trails offer glimpses of natural features like Penllergare Waterfall or the Rams Tor Headland.
For families, the flatter coastal paths around Swansea Bay are generally suitable. These routes offer easy terrain and pleasant scenery without significant climbs, making them enjoyable for riders of all ages and skill levels.
The area is highly rated by the komoot community, with an average score of 4.8 stars from over 40 reviews. Reviewers often praise the diverse landscape, from coastal paths to tranquil reservoir and forest trails, and the variety of routes suitable for different abilities.
Many areas in and around St. Thomas are accessible by public transport, particularly within Swansea. It's advisable to check local bus routes and timetables that serve the starting points of specific trails, especially those closer to urban areas or major roads.
Many trailheads, especially those near popular attractions like reservoirs or coastal areas, typically offer parking facilities. For routes starting further afield, such as those from Mynyddbach or Llansamlet, local parking options are usually available near the starting points.


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