In reply to Chad123: We've bouldered there- before we went the only info I could find was in Stone Country's Bouldering in Scotland which described "The Ring of Fire" as basically just getting out and exploring everything round the rim of the caldera. We did easy stuff on the slabs above the track between Sanna and the old school at Achosnich. We're going back at the beginning of October- I'd be really interested to hear what problems you found during your visit. You're right- it's a fantastic location