Wildfire risk
With wildfire risk currently extremely high, we urge visitors to take extra care by avoiding any activity that could start a fire and immediately reporting any signs of smoke or fire to 999 to help protect people and wildlife. Please note, some of our nature reserves are closed due to wildfires, please check before you travel.
Advice on wildfire preventionThu 30 July 2026 12:00 Days out
Mawddach Valley - Arthog Bog
OpenSee opening timesPull on your wellies and squelch through this small but wonderful slice of nature, looking out for Grass Snakes, Siskins and dragonflies.
About
Arthog Bog in the pretty Mawddach Valley might be a small wetland reserve, but it's crammed full of wildlife and is a wonderful place to see beautiful and rare flowers, butterflies, dragonflies and all manner of birds, including flocks of Siskins and Long-tailed Tits.
It's a slice of mire that's full of the array of flowering plants associated with this habitat. The bog turns yellow in spring with mire flowers including iris and spearwort, as well as the rare and special wavy St John's Wort and 'Touch-me-not' Balsam at the mire and woodland boundary.
A quiet walk looking carefully in the ponds, or alongside the track may reward you with a quick glimpse of a Grass Snake. These beautiful, shy creatures are not poisonous and hunt for frogs in the wet areas. The wet woodland on the fringes of the bog features Willow Warblers and Bullfinches making their homes in the Alder and willow.
At a glance
At Morfa Mawddach station. Managed by Snowdonia National Park. 20 spaces. Tarmac surface. Limited lighting. No height restrictions.
Nearest accessible facilities in main park, owned and managed by Snowdonia National Park. (Toilets are usually only open in the summer months or school holidays.)
Nearest accessible facilities in main park, owned and managed by Snowdonia National Park. (Toilets are usually only open in the summer months or school holidays.)
Prior to your visit, please contact the reserve directly for detailed information. Rough Tarmac/compacted earth/compacted stone surface. One kissing gate (not managed by RSPB).
Prior to your visit, please contact the reserve directly for detailed information. Rough Tarmac/compacted earth/compacted stone surface. One kissing gate (not managed by RSPB).
Nearest toilets in main park, owned and managed by Snowdonia National Park. (Toilets are usually only open in the summer months or school holidays.)
BBQs are a fire risk, endangering other people and the precious wildlife and habitats here. They are not permitted on the reserve at any time.
Dogs are allowed but must be kept under close control.
Assistance dogs are welcome in all parts of the reserve.
See what’s here
Contact Mawddach Valley - Arthog Bog
mawddach.valley@rspb.org.uk 5 St Marys Terrace, Arthog, Gwynedd, LL39 1BQ 01654 700222