Mount Kallan
From The Stargate Omnipedia
Volcano on the Kelownan continent of the planet Langara, which had been dormant for hundreds of years. Beneath the surface, however, a magma flow continues to run free, dangerously near unstable pockets of naquadria. SG-1 and Jonas Quinn encountered the instability while probing into the planet with the Kelownan D.U.E.V. excavator.
KEY EPISODE
Fallout - The Kelownan excavator intersects the magma flow of the extinct volcano of Mount Kallan.