Coed y Brenin Forest Park
Gwynedd
The Gain Waterfall Trail is the flagship walking route at Coed y Brenin, a Forestry Wales site in the southern reaches of Eryri National Park near Dolgellau. This 6.6 km circuit climbs from the visitor centre over the Cefndeuddwr ridge before dropping into the next valley to reach the confluence of the Afon Gain and Afon Mawddach, where the two rivers meet in a series of waterfalls in a sheltered wooded gorge. The descent to the falls is steep and the path narrows considerably, but the reward is one of the quieter and more dramatic waterfall settings in Snowdonia. The 200 m of climbing is concentrated on the ridge crossing, and the return retraces the high ground before descending back to the start.
This is a dog friendly walk that delivers genuine drama in a forest setting. The forest carries a deep, resinous scent of mature conifers that shifts to the fresher mineral smell of the rivers as you descend toward the gorge. Both the Afon Gain and Afon Mawddach offer excellent water access for drinking and swimming. Off-lead potential is high through the forest sections where livestock are largely absent, making this one of the better off-lead options in the national park. The steeper, narrower path down to the falls requires dogs to be managed carefully, with loose surface and unprotected drops into the river gorge demanding caution. A walk that suits confident dogs of most ages and sizes, with the waterfalls providing a spectacular midway reward.
At a Glance
- Distance
- 6.6 km (4.1 miles)
- Difficulty
- Moderate
- Duration
- 2 hr 30 min
- Walk Type
- Forest, Waterfall, River
- Route Type
- Circular
- Off Lead Potential
- High
- Livestock Risk
- Low
- Facilities
- Visitor centre; café (seasonal hours, check before visiting); bike shop (Beics Brenin); toilets; picnic benches; play area
- Parking
- Coed y Brenin Visitor Centre, LL40 2HZ. Pay and display: up to 1 hour £1, up to 3 hours £3, all day £5. Free for Blue Badge holders and local LL40/LL41 residents with V5 log book
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Frequently Asked Questions
Is Coed y Brenin Forest Park dog friendly?
Yes, Coed y Brenin scores 8 out of 10 for dog friendliness and makes for a genuinely rewarding outing with your dog. The Gain Waterfall Trail offers plenty of space to roam through mature forest, and both the Afon Gain and Afon Mawddach provide good opportunities for dogs to drink and swim along the way.
Can dogs be off lead at Coed y Brenin Forest Park?
Off-lead potential is high through the forest sections, where livestock are largely absent , making this one of the better off-lead options in Eryri National Park. The exception is the steeper, narrower path down to the waterfalls, where loose surfaces and unprotected drops into the river gorge mean you'll want to keep your dog on a lead and under close control.
What should I know before visiting Coed y Brenin Forest Park with my dog?
The Gain Waterfall Trail is a 6.6 km circuit with around 200 m of climbing, so it suits confident dogs of most ages and sizes rather than very young puppies or elderly dogs who struggle with hills. The descent to the waterfalls is steep and narrow, so take extra care on that section. Parking is pay and display at the visitor centre (LL40 2HZ), and there's a café on site with seasonal hours, so it's worth checking opening times before you go.
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