Best mountain peaks around Mountain Ash West are situated in the Cynon Valley, Rhondda Cynon Taf, Wales. This region provides access to notable hills and elevated areas, offering opportunities for outdoor activities. The landscape features varied terrain, including hills with historical significance and distinct geological formations. Visitors can find numerous elevated points that provide views of the surrounding Welsh landscape.
Last updated: May 2, 2026
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At 457 metres high, Mynydd Aberdar is a UK designated P100, or Hump, with a 100 metres of prominence. It is situated on a high point that forms a ridge between Merthyr Tydfil and Aberdare. There are fine views of both valleys to be had from here.
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Mynydd Ton 539m P92 (1768ft) TP5043 - Mount William Meyrick S2246 Welsh Dewey and Dodd summit Welsh Trig Pillar
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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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Mynydd y Glyn is a mountain in South Wales, between the towns of Pontypridd and Tonyrefail. It has a height above sea level of 377 metres. It is the mountain which was used in The Englishman who went up a Hill and came down a Mountain in which Hugh Grant and Ian McNeice star as English cartographers. In the film the mountain is known as 'Ffynnon Garw'. It is a UK listed Marilyn.
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Cefn Eglwysilan is a hill in South Wales, the twin 1,253 feet (382 m) summits of which lie just over one mile (2 km) east of Pontypridd in Rhondda Cynon Taf county borough. Its eastern side lies within the community of Aber Valley in Caerphilly county borough. Like neighbouring Mynydd Eglwysilan, the hill is named after the hamlet of Eglwysilan, the church here being dedicated to an obscure saint Ilan. A wireless transmission station is sited on the more northerly of the two summits (at OS grid ref ST 099911). The southerly one is crowned by a trig point. It is a UK listed Marilyn.
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The region offers several prominent elevated areas. Two notable examples include Cefn Eglwysilan Trig Point, with its twin summits reaching 382 meters, and Twyn Brynbychan Trig Point, which stands at 411 meters and is known for its ridgeway walks. Another significant peak is Mynydd y Glyn Summit, a 377-meter Marilyn located between Pontypridd and Tonyrefail.
From peaks like Cefn Eglwysilan, you can enjoy expansive views over the South Wales Valleys, including Pontypridd, and potentially as far as Garth Hill. Twyn Brynbychan is highly regarded for its 'amazing views in every direction,' encompassing Mountain Ash, Aberdare, and stretching across to the Brecon Beacons. Mynydd Aberdar Summit also offers fine views of both the Merthyr Tydfil and Aberdare valleys.
Yes, Cefn Eglwysilan offers relatively accessible walking routes with broad and easy-to-follow paths, making it suitable for most people looking for a casual walk. Its summit plateau is open access, providing public rights of way.
Yes, on Cefn Eglwysilan, you can find the Senghenydd Dyke, an ancient linear earthwork stretching across its eastern side. This feature is believed to have marked the boundary of a 13th-century deer park associated with Caerphilly Castle, offering a glimpse into historical land use.
Many of the hills in the area, such as Cefn Eglwysilan, offer moderate and accessible paths suitable for families. The ridgeway walks on Twyn Brynbychan, often involving fire roads through pleasant forest scenery, can also be an enjoyable outing for families.
The area around Mountain Ash West offers a variety of outdoor activities. You can explore numerous mountain biking trails, including those detailed in the MTB Trails around Mountain Ash West guide. There are also options for gravel biking, with routes like the Talybont Reservoir loop, found in the Gravel biking around Mountain Ash West guide, and road cycling routes, such as the Smooth Tarmac Cycleway, available in the Road Cycling Routes around Mountain Ash West guide.
The region is generally accessible year-round. Spring and autumn offer pleasant temperatures and vibrant scenery, while summer provides longer daylight hours. Winter hiking is possible, but conditions can be more challenging, requiring appropriate gear for potentially wet or icy paths.
While specific public transport routes directly to all trailheads might vary, the area is situated within the Cynon Valley in Rhondda Cynon Taf, Wales. Many routes for hills like Cefn Eglwysilan connect with routes between Nelson and Senghenydd, which may be accessible via local bus services from nearby towns like Pontypridd or Mountain Ash. Checking local bus schedules for services to villages surrounding the hills is recommended.
While many routes are moderate, some peaks like Mynydd Ton Summit, at 539 meters, offer a more significant ascent. The ridgeway walks on hills such as Twyn Brynbychan can be extended to create longer, more challenging treks, especially when combined with paths towards Mynydd Gethin and Mynydd Aberdare.
The geology of hills like Cefn Eglwysilan consists of Hughes Sandstone from the Carboniferous Period, with underlying siltstone and mudstone layers, dating back around 309 million years. These ancient formations add an extra layer of interest to a visit.
The region is close to towns like Mountain Ash, Pontypridd, and Aberdare, which offer various options for cafes, pubs, and accommodation. It's advisable to plan your route and check for establishments in the nearest towns or villages before or after your hike.
Visitors appreciate the 'amazing views in every direction' from peaks like Twyn Brynbychan, often enjoying a breather at the trig point after a moderate hike. The area is valued for its accessible walking routes, historical significance, and the rewarding panoramic vistas of the surrounding Welsh landscape.
Many of the hills, including Twyn Brynbychan, are known for their ridgeway walks, which can often be combined with other paths and forestry tracks to create circular routes. These routes might involve a mix of woodland and open meadows, offering varied scenery.


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