| Apoyo(noun, name, volcano, geology) |
| Apuseni Mountains(expression, name, volcano, geology) |
| Ara(noun, name, volcano, geology) |
| Argowayang(noun, name, volcano, geology) |
| Arintica(noun, name, volcano, geology) |
| Armadillo Peak(expression, name, volcano, geology, north) |
| Arpacay(noun, name, volcano, geology) |
| Asakusa(noun, name, volcano, geology) |
| Ascotan(noun, name, volcano, geology) |
| Asgura(noun, name, volcano, geology) |
| Ash Pit(expression, name, volcano, geology, north) |
| Ashitaka(noun, name, volcano, geology) |
| Asie(noun, name, volcano, geology) |
| Ata Volcanic Complex(expression, name, volcano, geology) |
| Atherton Volcanic Province(expression, name, volcano, geology) |
| Atwell Peak(expression, name, volcano, geology) |
| Auca Mahuida Volcanic Field(expression, name, volcano, geology) |
| Aucanquilcha(noun, name, volcano, geology) |
| Aurora-Bodie(noun, name, volcano, geology) |
| Avos' Rocks(expression, name, volcano, geology) |