Allt Rhyd Y Groes National Nature Reserve
Allt Rhyd Y Groes National Nature Reserve
28
runners
5
runs
Jogging around Allt Rhyd Y Groes National Nature Reserve offers routes through a landscape characterized by river valleys, reservoir views, and natural woodlands. The area provides a mix of terrain, from gentler paths along water bodies to more undulating trails. This region is well-suited for those seeking running routes within a natural reserve setting.
Last updated: July 4, 2026
4
runners
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
7
runners
5.25km
00:34
80m
80m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4
runners
11.7km
01:20
270m
270m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
7
runners
4.73km
00:30
60m
60m
Easy run. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
3
runners
10.3km
01:24
370m
370m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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A short climb up from the road brings you to the Dam and carpark, there is no access over the Dam itself. But you do get a good view over the spillway and valley below.
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Built in 1913 the Rhandirmwyn Bridge links the two sides of the Towy valley by this rivetted girder road bridge. On the southern side you'll find the Towy Bridge Inn, a lovely riverside pub.
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THE TALE OF THE WELSH “ROBIN HOOD” Known as Twm Siôn Cati Twm Siôn Cati is a historically known figure in Welsh folklore. A tale recounted by Meyrick recalls how Twm was asked by a poor man to steal a pitcher for him. They went together to a merchant where Twm started belittling the man's wares. Having told his friend secretly to take the pitcher of his choice, Twm distracted the merchant by telling him there was a hole in one of the pitchers, which the man denied. Twm desired him to put his hand in the pitcher to test it and the man still denied there was a hole. Twm then asked him how, if there was no hole, could he have put his hand inside? By this time his friend had disappeared with his pitcher, undetected. A tale from Prichard's book involves an occasion when Twm is staying in an inn overnight and realises other people are planning to rob him the following day after he sets off. He has a large sum of money with him. The following morning he behaves as though his money is in the pack-saddle of his horse. When the highwayman catches up, Twm drops the saddle in the middle of a pool. The highwayman wades into the pool to fetch it, Twm takes the opportunity to make off with the highwayman's horse. A complication arises because the horse responds to the voice of the highwayman crying "Stop!" Luckily Twm, in terror, happens to shout a word which makes the horse gallop on again, and he is conveyed to safety. Another tale recounts how Twm waylaid a rich squire, who was accompanied by his daughter, Twm was so smitten with her that he returned her jewellery to her and attempted to woo her, against her father's opposition and, initially, her own. One full moon shortly after the robbery, he crept to her window, roused her from sleep, caught her hand at the window and kissed it, refusing to let her go until she promised to marry him. She wouldn't promise so Twm drew his dagger, drew blood on her wrist and threatened to sever her hand unless she assented to marriage forthwith. She agreed to marry him and she kept her hand. Their marriage followed soon after, despite her father's views and the directness of Twm's courtship methods. The girl was supposedly the widow of the sheriff of Carmarthen. Through this marriage Twm is supposed to have gained respectability, eventually becoming a justice of the peace, sitting in judgement on others, a position he held until his death aged 79.
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This attractive RSPB site has a circular footpath adjacent to a river with beautiful rock cascades and old mossy trees. It is also home to the Twm Sion Cati's cave. All worth a look off of the bike.
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Fab but the roads over the top are NOT ROADS they are farm tracks. We had to carry our bikes over styles and push them through over animal tracks Would have broken a wheel otherwise However a fab experience none the less TIP: always check the pub is actually open and what time they close
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Llyn Brianne is a spectacular reservoir at almost 300m (990ft) above sea level. It is Wales second largest reservoir by volume and is contained by a 91m (300ft) stone-built dam, which is the largest of its kind in Europe.
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Delightful rural riverside location. Real ales usually from Welsh breweries. There is a large outdoor seating area with views across the river. Popular with walkers, bikers, cyclists and dogs welcome too!
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There are approximately 5 running routes detailed in this guide for Allt Rhyd Y Groes National Nature Reserve, offering a variety of experiences for joggers.
Yes, the area offers easy running options. For instance, the Rhandirmwyn Bridge – The Towy Bridge Inn loop from Rhandirmwyn is an easy 4.7 km (2.9 miles) route, perfect for a gentle run through the local landscape.
The running routes in Allt Rhyd Y Groes National Nature Reserve feature a mix of terrain, including paths along river valleys, trails with reservoir views, and sections through natural woodlands. You'll find both gentler paths and more undulating trails.
Yes, for those seeking a more demanding run, the Royal Oak Inn loop from Rhandirmwyn is a difficult 10.3 km (6.4 miles) route with significant elevation gain, providing a good challenge.
The routes vary in length and duration. You can find runs ranging from around 4.7 km (2.9 miles) taking about 30 minutes, up to 11.7 km (7.3 miles) which might take approximately 1 hour 20 minutes, depending on your pace and the trail's difficulty.
Many of the popular running routes in the area are indeed circular, allowing you to start and finish at the same point. Examples include the Llyn Brianne Dam – Llyn Brianne Dam Crossing loop from RSPB Gwenffrwd-Dinas and The Towy Bridge Inn – Rhandirmwyn Bridge loop from Rhandirmwyn.
Runners can enjoy stunning reservoir views, particularly around the Llyn Brianne Dam, as well as picturesque river valleys and tranquil natural woodlands. The landscape offers a beautiful backdrop for your run.
While specific 'family-friendly' designations aren't provided, the easier and shorter routes, such as the 4.7 km Rhandirmwyn Bridge – The Towy Bridge Inn loop, could be suitable for families looking for a less strenuous outdoor activity.
Runners frequently appreciate the diverse natural setting, including the reservoir views and wooded paths. The variety of routes, from easy to challenging, also makes it a popular choice for different fitness levels.
The reserve is beautiful year-round, but spring and autumn often offer the most pleasant running conditions with mild temperatures and vibrant scenery. Summer can be warm, while winter runs might require appropriate gear for potentially wet or chilly weather.
The routes often pass near small villages like Rhandirmwyn, where you might find local inns or pubs such as The Towy Bridge Inn or the Royal Oak Inn. These can be good spots for a post-run refreshment, though it's always wise to check opening times in advance.


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