
Where to go · Gwynedd
Forest bathing at Coedydd Maentwrog and Coed Llyn Mair
Humid remnant oak rainforest above the Vale of Ffestiniog, with a small lake, mossy boulders and the Ffestiniog Railway.
Coedydd Maentwrog is a National Nature Reserve of oak woodland on the slopes above the Vale of Ffestiniog, a remnant of the Celtic rainforest that once covered western Britain. High rainfall and spray from steep streams keep the air damp, so the wood holds around 200 kinds of mosses and liverworts and 120 lichens. Rare lesser horseshoe bats live here, and redstarts, pied flycatchers and wood warblers arrive in summer.
Start at the free Coed Llyn Mair car park, opposite the lake and its picnic area. The Coed Llyn Mair Walk is a short loop on natural ground with rocks, roots, several flights of steps and sculptures along the way. The Station Link Walk climbs gently to Tan y Bwlch station on the Ffestiniog Railway, with resting places every hundred metres or so and picnic tables at the top. Both are short, so you can take your time.
Practical
- Managed by
- Natural Resources Wales
- Parking
- Free Coed Llyn Mair car park; no overnight parking
- Terrain
- Natural paths with rocks, roots and steps; steep, uneven sections on the eastern return
- Nearest station
- Penrhyndeudraeth (mainline); Tan y Bwlch on the Ffestiniog Railway
- Facilities
- Lakeside picnic area, picnic tables; no toilets listed
- Opening and entry
- Open access, free
- Official page
- naturalresources.wales
Last updated 4 November 2026. Paths, parking and access can change, so check before you visit. Spotted something out of date? Please let us know.
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More woodlands in Gwynedd
All venues in Gwynedd
Beddgelert ForestLarge forest north of Beddgelert with views to Yr Wyddfa and a quiet lake
Ceunant Cynfal National Nature ReserveNarrow oak-lined gorge below Llan Ffestiniog, with cascades and Huw Llwyd's Pulpit
Ceunant Llennyrch National Nature ReserveDeep, mossy gorge of the Afon Prysor near Maentwrog, with oak rainforest and a waterfallPhotos: Beddgelert Forest, scotbotwylie (CC BY 2.0); Ceunant Cynfal National Nature Reserve, David Medcalf (CC BY-SA 2.0); Ceunant Llennyrch National Nature Reserve, David Medcalf (CC BY-SA 2.0).