Carnedd y Filiast (Welsh Marilyn)

This is a blue plus walk to ‘bag’ the Marilyn of Carnedd y Filiast, near Cerrigydrudion on the border of the Snowdonia National Park. The ascent is fairly easy but there are some boggy sections in the second part of the walk so good boots are essential!


27 August 2023

No dogs

From the layby, we head back east along the road to begin the ascent of Carnedd y Filiast on an excellent track that climbs steadily and easily (except for stepping stones across a stream!) all the way to the summit to achieve the Marilyn.

We then follow a clear fence line, walking in a westerly direction, across rough terrain with some boggy sections. Fortunately, there is an elevated non-boggy spot for lunch! The next path heads broadly south back towards Lynn Celyn with a short section of quiet road and a very pleasant walk through woodland to return to the cars.

On a clear day, we will have excellent views, including Arenig Fach and the Rhinogs to the west, Snowden and Moel Siabod to the northwest and the Clwydian range to the northeast.

This walk is planned for a bank holiday weekend so I have made it an early start to avoid traffic!

There is a very good path up to Carnedd y Filiast but then there are sections of pathless, rough terrain and bogs. Good waterproof boots are essential gaiters and poles are advisable.
OL18 Harlech, Porthmadog and Bala
Starting Point:
Capel Celyn layby on the A4212 at the western end of Llyn Celyn (if you get to the chapel you have gone too far!) LL23 7NY GR SH856 410
Walk Starts:
Walk Finishes:
Highest Point:
669m Carnedd y Filiast


Let the walk leader know of any relevant medical conditions

Refer to the Handbook for walk related information and specifically for recommended walking equipment and safety information

Remember you are responsible for being properly equipped

Ensure you have the walk leader’s phone number in case of an emergency

If you become detached from the group STOP, call out; try contacting group by phone or text. If no contact return to the last place you were with the group. Wait 30 mins repeatedly trying to make contact. After 30 mins seek help and/or make your own way safely.

The Google map below is the location of the walk start point.