Nantlle Ridge – Two Welsh Marilyns

The Nantlle Ridge is a classic, one of the best ridge walks in the country with its magnificent views, a bit of scrambling and an arête. It encompasses the Welsh Marilyns Trum y Ddysgl and Craig Cwm Silyn.


4 June 2023

No dogs

We start the walk from Rhyd Ddu crossing low land before the 1km ascent to Y Garn at 633m. After a break we turn along the ridge heading for the scramble up or around Mynydd Drws y Coed, there is exposure on this section, then along a grassy ridge to Trum y Ddysgl. To reach our next destination, the obelisk at Mynydd Tal-y-mignedd, we cross a 200m arête. From the obelisk we head in a southerly direction dropping down to cross Bwlch Dros-bern before a stiff climb alongside Craig Pennant to reach our highpoint at Craig Cwm Silyn.

This next part of the walk has not been recce’d, we will find our way on the day. Our return path takes us back down the steep descent off Craig Cwm Silyn to Bwlch Dros-bern and continues as we descend towards the disused quarry at Cwm Trwsgl. If the descent off Bwlch Dros-bern looks too difficult we will return to the obelisk and back across the arête before descending.

We head uphill from the quarry and into the Beddgelert Forest. Emerging from the forest we cross the lower reaches of Cwm Marchnad before picking up our outward path across the low land to the cars.

This walk will only be undertaken if the wind speed is lower than moderate (safety) AND there is good visibility (views).

Steep inclines and descents over rough ground. Some scrambling and arête. Some exposure.
OL17 Snowdon & Conwy Valley
Starting Point:
Rhyd-Ddu railway station pay and display car park. Post code LL54 6TN GR:SH571525
Walk Starts:
Walk Finishes:
Highest Point:
734m Craig Cwm Silyn


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.