| Ruby Mountain(expression, name, volcano, geology, north) |
| Salar Grande(expression, name, volcano, geology) |
| Sar'akhor(name, volcano, geology) |
| Seconed Canyon Cone(expression, name, volcano, geology, north) |
| Sheep Track Pumice(expression, name, volcano, geology, north) |
| Sidas Cone(expression, name, volcano, geology, north) |
| Siletz River Volcanics(expression, name, volcano, geology) |
| 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) |
| South Tuya(expression, name, volcano, geology, north) |
| Sphinx Dome(expression, name, volcano, geology, north) |
| Storm Cone(expression, name, volcano, geology, north) |
| Swinton Creek Volcano(expression, name, volcano, geology, north) |
| Tadeda Centre(expression, name, volcano, geology, north) |
| Tadekho Hill(expression, name, volcano, geology, north) |
| Tennena Cone(expression, name, volcano, geology, north) |
| Thaw Hill(expression, name, volcano, geology, north) |