EntityQ8522006· pop 6· linked from 94 articlesMount SylvaniaSign in to saveextinct volcano in Portland, ORConnectionsvolcanoEntityOregonEntitygeographic coordinate systemEntityInternational Standard Book NumberEntityPortlandEntityetymology scienceEntitymountain rangeEntitysummitEntityCascade RangeEntityUnited States Geological SurveyEntitytopographic prominenceEntityCrater LakeEntitytopographic mapEntityPendletonEntityLake OswegoEntityNational Oceanic and Atmospheric AdministrationEntityshield volcanoEntityMultnomah CountyEntityTigardEntityUnited States Department of CommerceEntityCategoriesCascade VolcanoesLake Oswego, OregonLandforms of Multnomah County, OregonMountains of Clackamas County, OregonMountains of OregonShield volcanoes of the United StatesSubduction volcanoesVolcanoes of Clackamas County, OregonVolcanoes of Multnomah County, OregonVolcanoes of Oregon