4.4
(230)
2,186
hikers
166
hikes
Hikes around Penrhiwceiber explore the steep-sided Cynon Valley, a landscape shaped by its industrial past. The terrain features ascents to viewpoints on surrounding hills, paths following former tramways, and routes through nearby woodlands. This setting in the Welsh Valleys provides a mix of historical interest and natural features for walkers.
Last updated: May 12, 2026
5.0
(1)
32
hikers
6.53km
01:48
110m
110m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
4.8
(5)
14
hikers
14.6km
04:26
470m
470m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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5.0
(1)
10
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
5.0
(1)
5
hikers
6.52km
02:09
300m
300m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
4.0
(4)
5
hikers
10.5km
03:11
350m
350m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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Gillies Trail and Waterfall in Caegarw, Mountain Ash. Not many people are aware of the path that leads up to the mountain behind Caegarw and the impressive waterfall that is only a short 10 minute walk from the start of the trail. The path is accompanied by a beautiful river which follows alongside for a good part of the trial and there is a fair share of wildlife to spot too! If you’re looking for a new place to visit in Mountain Ash or a place to go with your dogs off the lead, this is ideal!
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High above the A470 to the north of Quaker’s Yard, the Giant’s Bite is a dramatic gap in the skyline quarried from the ridge top at the former Cefn Glas mine and quarry. ❤️👌 The site was intensively grazed up to the mid-1990s when a large belt of native trees were planted on the lower slopes. These trees are now maturing and have helped to heal the visible mining scares. The shales forming the upper soil horizons support a wide variety of native flowering grassland species including wild strawberry, cowslip, foxglove and wild thyme, and the site is increasingly becoming re-vegetated by scrub species. Incredibly Fine views of the Taff and Cynon valleys are afforded from the summit ridge, while the line of the former Glamorganshire Canal is also discernible.
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this has seating so you can take a break and take in the beauty of the stunning views.
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We walked miles. Up to the waterfall on Gillies trail, followed the path up onto the rocky and then to the trig point on Twyn Brynbychan, above the cynnon valleys. Enjoyed a breather on top, before trekking around the back forestry where you can see Aberfan and Merthyr Vale and headed over to the bronze age sight before descending down to Cwmaman and back to the car.
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Yes, there's a wide selection of trails. You can find over 170 hiking routes in the area, ranging from gentle valley walks to more strenuous climbs up the surrounding hills.
The hiking here is defined by the steep-sided Cynon Valley. Many trails involve ascents to viewpoints like Twyn Brynbychan, while others follow paths along former industrial tramways, offering a unique mix of natural scenery and local history.
Definitely. For a gentler outing, consider the Waterfall loop from Stanleytown. It's a relatively flat 4-mile (6.4 km) walk that's suitable for most fitness levels and is a great option for a family walk.
Yes, the area is generally dog-friendly. The open hills and woodland paths are great for walking with a dog. However, you may encounter livestock on the higher ground, so it's always best to keep your dog on a lead in these areas.
Most of the popular routes in the area are circular. For a longer, more challenging loop that offers fantastic views, the Twyn Brynbychan Trig Point loop from Mountain Ash is a great choice. It's a 10.6-mile (17 km) circuit that takes you up to a key viewpoint.
The trails are well-regarded by the komoot community, which has been explored by over 2,000 hikers. Reviewers often praise the stunning panoramic views from the ridges and the interesting blend of natural beauty with the region's industrial heritage.
The valleys around Penrhiwceiber have several trails leading to waterfalls. A popular option is the Forest Path – Gillies Trail Waterfall loop from Mountain Ash, a moderate 6.5-mile (10.5 km) hike that guides you through woodland to a lovely cascade.
For some of the best views, head for the hills surrounding the valley. Twyn Brynbychan is a popular summit with a trig point offering panoramic vistas. Another great spot is near Perthcelyn Reservoir, which provides fantastic views across to the gap known locally as the Giant's Bite.
Many paths you'll walk on have a rich history tied to the coal mining industry. You can often find remnants of old tramroads, sometimes with stone sleepers still visible. These routes were once used to transport coal and now serve as a tangible link to the heritage of the Welsh Valleys.
Many hikes start from the nearby towns of Mountain Ash or Abercynon, where you can find street parking or public car parks. For specific routes, like those heading to Twyn Brynbychan, some hikers park near the start of the trail by the Giant's Bite, but be sure to park considerately and not block any access.
Yes, Penrhiwceiber and the surrounding towns like Mountain Ash have train stations and bus services connecting them to Cardiff and other parts of the Valleys. This makes it feasible to access many trailheads without a car.


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