As the Covid-19 lockdown eases, access for climbing is opening back up, subject to some measures and restrictions depending on where you are going. Please make sure you have read and understood our current advice before heading out and apply it alongside RAD advice to ensure access issues don’t develop.

Craig Y Tonnau


A pleasant small crag, with unusual rock. Its South aspect, low altitude and shelter from the forest can make climbing viable here when the mountain crags are impossible-the same features make it ideal for midges however, avoid the crag on still days!Many of the routes are overgraded in the CC guide, in particular Dentist's Slab is easy V Diff (perhaps only Diff), and Brewer's Troupe is Very Severe 4c. Some of the Severes (especially Robbin's Nest) would only get V Diff on other crags in the guidebook.The less-than-vertical, well featured rock makes this a climb-anywhere crag, leading to quite a few claims for new routes (here and elsewhere). 

Crag information
Climbing Area: Wales Rock Type: Volcanic
Importance: Local CRoW Land: No
Ownership: Private Woodland No. of Routes: 20
Within National Park: Yes Year Developed:
Grid Reference: SH6992351890

Parking and Approach

Situated in a private forest; the owner encourages public access. The descent to the crag from the ridge at the west end is getting eroded and can be muddy, an easier-angled approach can be made from the east end of the crag-easier to find when leaving! Move out of the power line firebreak here and go across to here

Group Advice

Frequently used by groups. However in 20017 the woods appear to be managed by a private agency for the absentee owners. There have been some reports of organised groups being asked to apply for license to climb here. In additon the woodland managers do not wish groups to be in the woods when felling/contractor operations are underway (usually mid-week only).  It's thought this work may be completed by mid 2018. 
Area information

A wide range of cliffs - mainly traditional and multi pitch inc. the popular Llanberis Pass, Idwal Slabs, Clogwyn du'r Arddu and Cwm Silyn cliffs, but also outlying outcrops such as Carreg Alltrem. Many crags are on CROW access land - but not all especially some of the outcrops which lie on private enclosed land. Most of central Snowdonia is both designated an SSSI and also is an European Special Area of Conservation on account of the upland habitat and associated geology and plants found here.

Weather Information

There are no guidebooks assigned to this crag

There are no files associated with this crag

Crag Update Feed

Use this feed to update other users about crag conditions or similar current information. Suggested updates to page information should be made using the ‘report a page issue’ button above.

Posting as Anonymous Community Standards
3000 characters remaining
Your comment has been posted below, click here to view it
Comments are currently on | Turn off comments
Anonymous User
Ownership and access has changed. Could you cut and paste the new text from UKC and change the access status to amber please
Scott Titt UKC crag moderator.
Anonymous User
The owner does not encourage public access. Forestry operations are taking place on weekdays throughout the summer of 2017 so the crag is best avoided at these times.
Anonymous User
Where the track leaves the parking area is a prominent notice stating "Private land - no public right of way".
Anonymous User
Altenative route from track leaving the parking area: To avoid the fire break walk in, follow the track for approx 600m to where there track is runs parallel with the craig on your left hand side. There is a large area on RHS tree feld area. You pass a small slab on LHS and another 50 meters there is a small track going left to top RHS of the craig. This takes you to the decent route down the top of the pitches.