4.3
(70)
364
hikers
23
hikes
Hiking around Allt Rhyd Y Groes National Nature Reserve offers a variety of trails through a landscape characterized by woodlands, river valleys, and open countryside in Carmarthenshire. The area features diverse terrain, including paths alongside water features like the Llyn Brianne Reservoir and its associated dams. Hikers can expect a mix of gentle slopes and more challenging ascents, providing options for various fitness levels. This National Nature Reserve is known for its natural beauty and varied ecosystems.
Last updated: May 7, 2026
4.0
(2)
8
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
4.4
(16)
57
hikers
13.5km
03:48
270m
270m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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5.0
(1)
9
hikers
2.54km
00:44
60m
60m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
3.0
(1)
19
hikers
23.7km
06:47
550m
550m
Hard hike. Very good fitness required. Mostly accessible paths. Sure-footedness required.
5.0
(6)
78
hikers
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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Popular around Allt Rhyd Y Groes National Nature Reserve
MTB Trails around Allt Rhyd Y Groes National Nature Reserve
Cycling around Allt Rhyd Y Groes National Nature Reserve
Road Cycling Routes around Allt Rhyd Y Groes National Nature Reserve
Gravel biking around Allt Rhyd Y Groes National Nature Reserve
Running Trails around Allt Rhyd Y Groes National Nature Reserve
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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Tales about him vary on details, but he is usually said to have been born in or very near to Tregaron, in or around 1530, his mother being one Cati Jones of Tregaron. His father was supposed to be Siôn ap Dafydd ap Madog ap Hywel Moetheu of Porth-y-ffin, also near Tregaron. He was an illegitimate son whose mother named him Thomas. The Welsh-language equivalent of Tom is Twm. It was also common practice in rural Wales for children with common names to be nicknamed after their mothers. Thus he became known as Twm Siôn Cati.
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There are over 20 hiking trails available in Allt Rhyd Y Groes National Nature Reserve, offering a diverse range of experiences from easy strolls to more challenging ascents.
Yes, the reserve offers several easy trails perfect for families. An example is the Gwenffrwd-Dinas Nature Reserve – Twm Siôn Cati's Cave loop from RSPB Gwenffrwd-Dinas, which is 1.6 miles (2.6 km) long and takes about 45 minutes to complete through the nature reserve.
Generally, dogs are welcome on trails in the Allt Rhyd Y Groes National Nature Reserve, but it's important to keep them on a lead, especially near livestock or in areas designated for wildlife protection. Always follow local signage and respect the natural environment.
Allt Rhyd Y Groes National Nature Reserve is known for its diverse ecosystems. Hikers often spot various bird species, including red kites, and may encounter other woodland creatures. The reserve's varied habitats support a rich array of flora and fauna.
Yes, for those seeking a challenge, there are difficult routes available. The Llyn Brianne Reservoir loop is a difficult 14.7-mile (23.7 km) trail with significant elevation gain, offering a strenuous but rewarding experience.
The reserve is beautiful year-round, but spring and autumn are particularly popular. Spring brings vibrant wildflowers and active wildlife, while autumn offers stunning foliage. Summer is ideal for longer days, and winter can provide peaceful, crisp walks, though some paths may be muddy or icy.
Many of the trails in the reserve are circular, allowing you to start and end at the same point. An example is the Llyn Brianne Dam Crossing – Llyn Brianne Dam loop from Rhandirmwyn Bridge, a moderate 8.4-mile (13.5 km) path offering reservoir views.
Parking is available at various points around the reserve, often near popular trailheads or visitor access points. Specific parking details can usually be found on individual route descriptions on komoot or local signage.
The area is highly rated by the komoot community, with an average score of 4.3 stars from over 60 reviews. Reviewers often praise the diverse terrain, the tranquil woodland paths, and the stunning views of the Llyn Brianne Reservoir and its associated dams.
Yes, some trails feature waterfalls. For instance, the Waterfall Viewpoint – Allt Nantrhydifor Gravel Climb loop from Gallt Y Berau is a moderate route that includes a viewpoint overlooking a waterfall, offering a scenic highlight.
Public transport options to the more remote parts of Allt Rhyd Y Groes National Nature Reserve are limited. It is generally recommended to travel by car to access the various trailheads. Some local bus services might operate to nearby villages, but onward travel to the reserve itself may require a taxi or a longer walk.
While the immediate vicinity of the reserve is quite rural, there are pubs and small eateries in nearby villages such as Rhandirmwyn. It's advisable to check opening times and availability in advance, especially during off-peak seasons.


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