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Euskal Herria
| Nombre | Altitud | Zone | Ph. |
| Sierra Grande | 450 | | 7 |
| Sierra Txikita | 994 | | 8 |
| Sierragaina | 1307 | | 11 |
| Siguesko Muga | 1173 | | 9 |
| Soila | 990 | | 37 |
| Solaiera | 1039 | Garobel / Sálvada | 56 |
| Solano Mayor | 823 | | 8 |
| Sollaundi | 1043 | | 17 |
| Sollube | 686 | | 14 |
| Somedera | 657 | | 5 |
| Somo | 902 | | 23 |
| Somo | 1171 | Garobel / Sálvada | 24 |
| Somorrubio | 570 | | 8 |
| Sopeña | 470 | | 8 |
| Soporro | 617 | | 21 |
| Soratxipi | 1069 | | 41 |
| Soroluzeta | 1013 | | 5 |
| Sorotepo | 1151 | | 17 |
| Sotoaldapa | 589 | | 5 |
| Soumcouy | 2315 | Larra | 11 |
| Subezelaigañe | 1222 | | 28 |
| Sugizeaga | 567 | | 7 |
| Surbe | 1155 | | 24 |
| Surgurin | 784 | | 8 |
| Tabar, Sierra de | 791 | | 16 |
| Tangorri | 845 | Aranguren | 15 |
| Tartazupe | 758 | | 10 |
| Taxoareko gaina | 672 | Taxoare | 23 |
| Tellakaskueta | 1179 | Aizkorri | 24 |
| Tellamendi | 835 | | 56 |
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