Although generally small and scattered the wonderful rock texture and the setting high on the hills over the Mawddach estuary make this a worthwhile venue. All the boulders are near parking, the longest walk is 5 minutes.
Steve Hobbs wrote another great guide to the Torrent Walk Gorge in Dolgellau.
Moel Y Penmaen OS 72414 30146, a small, excellent bouldering spot just north of Coed y Brenin. See document for more details: moel_y_penmaen__os_72414_30146_topo(1)