Siskin - Image Credit: Ben Andrew

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Arthog Bog, near Barmouth is a small wetland and a wonderful place to see weird and wonderful plants, flowers, butterflies and birds. It's one of the remaining fragments of raised bog which once would have covered much of the adjacent Mawddach Estuary in southern Snowdonia.

With more than 130 species of plants recorded, there are colourful displays through the year such as marsh marigold and yellow flag in the spring and hemp agrimony, meadowsweet and ragged robin through the summer. Many species of butterfly have been recorded on the reserve and common blue, small copper and speckled wood are among those regularly encountered. There are also many specialised ditch plants such as bog bean and greater spearwort.

In winter there are often flocks of siskins, lesser redpolls and tits and ravens, buzzards and peregrines are commonly seen overhead. Spring sees the arrival of whitethroats, garden warblers and blackcaps, and lesser spotted woodpeckers may venture over from the adjacent oak woodland. The reed-filled ditches around the reserve are also home to reed buntings and water rails.

Arthog Bog Nature Trail

The nature trail is 1 mile (1.5 km) that crosses the reserve and links in with the Mawddach cycle trail; sturdy footwear is recommended on the nature trail. The scarce wetland plants, characteristic of this habitat, thrive on open, wet and well-lit conditions and cannot compete with more aggressive species such as willows or brambles. For part of the year, the bog is lightly grazed by ponies and we make sure the areas alongside wet areas and ditches are free of scrub.

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Booking & Payment Details

  • Free Entry


  • Picnic site - Picnic area in main car park


  • Children welcome


  • Free Parking - 20 spaces at Morfa Mawddach station, managed by Snowdonia National Park. Limited lighting and no height restrictions.

Property Facilities

  • Dogs Accepted

Target Markets

  • Accepts groups

Map & Directions

Road Directions

Take the A493 from Dolgellau towards Fairbourne. Between the villages of Arthog and Friog take the turn for Morfa Mawddach railway station; parking is available at the station. The main Reserve entrance is on the road 100 yards before the car park.

The nearest bus stop is at Arthog (Glasfryn Terrace) on the Dolgellau to Twywn (28) route. The stop is 400 yards from the reserve entrance.

Accessible by Public Transport: Morfa Mawddach station is 0 miles away.

RSPB Mawddach Valley - Arthog Bog

Type:Nature Reserve

5 St Marys Terrace, Arthog, Gwynedd, LL39 1BQ

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Tel01654 700222

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