| Picabo volcanic field(expression, name, volcano, geology, geohistory) |
| Pillow Ridge(expression, name, volcano, geology, north) |
| Potrillo volcanic field(expression, name, volcano, geology, geohistory) |
| Prindle Volcano(expression, name, volcano, geology, north) |
| Ridge Cone(expression, name, volcano, geology, north) |
| Ruby Mountain(expression, name, volcano, geology, north) |
| Salal Creek Pluton(expression, name, volcano, geology, geohistory) |
| San Felipe volcanic field(expression, name, volcano, geology, geohistory) |
| Santa Barbara Island(expression, name, volcano, geology, geohistory) |
| Seconed Canyon Cone(expression, name, volcano, geology, north) |
| Sezill Volcano(expression, name, volcano, geology, north) |
| Sheep Track Pumice(expression, name, volcano, geology, north) |
| Sidas Cone(expression, name, volcano, geology, north) |
| Sixty Mile(expression, name, volcano, geology, north) |
| Sleet Cone(expression, name, volcano, geology, north) |
| Snippaker Creek Cone(expression, name, volcano, geology, north) |
| Snowshoe Lava Field(expression, name, volcano, geology, north) |
| Source Hill(expression, name, volcano, geology, north) |
| Sousaki volcano(expression, name, volcano, geology, geohistory) |
| South Tuya(expression, name, volcano, geology, north) |