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Euskal Herria
| Nombre | Altitud | Zona | Ph. |
| Ogal | 952 | | 8 |
| Ogoño / Atxurkulu | 305 | | 25 |
| Oiakarizketa | 987 | | 16 |
| Oianmuga | 1149 | | 11 |
| Oiarbide | 1191 | | 19 |
| Oiartzabal | 1003 | | 8 |
| Oiezki | 823 | | 7 |
| Oihanberri | 817 | | 3 |
| Oihanburu | 875 | | 2 |
| Oilarandoi | 933 | | 17 |
| Oindi | 548 | | 52 |
| Oindolar | 430 | | 15 |
| Oiz | 1026 | Oiz | 39 |
| Okabe | 1466 | | 20 |
| Okabio | 864 | | 14 |
| Oketa | 1031 | Gorbeia | 41 |
| Okoro | 1259 | | 41 |
| Olagaina | 1069 | | 6 |
| Olano | 1082 | | 41 |
| Olataguas | 1035 | | 7 |
| Olate | 934 | | 29 |
| Olatz | 884 | | 14 |
| Olbidea | 1141 | | 10 |
| Olderitz | 1172 | | 8 |
| Olejua | 699 | | 3 |
| Olkotz | 700 | | 5 |
| Ollaran | 682 | | 6 |
| Ollaran | 784 | | 7 |
| Ollargain | 701 | | 9 |
| Olotoki | 1280 | | 19 |
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