Mount Mazama is in Klamath County, within the U.S. state of Oregon, north of the border with California. It lies in the southern portion of the Cascade Range. Crater Lake sits partly inside the volcano's caldera, with a depth of ; it is the deepest body of freshwater in the United States and the second deepest in North America after Great Slave Lake in Canada. Before its caldera-forming eruption, Mazama stood at an elevation between , placing it about above the lake; this would have made it Oregon's highest peak. The Global Volcanism Program currently lists its elevation at , while the Geographic Names Information System provides an elevation of .