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Euskal Mendiak
| Nombre | Altitud | Zone | Ph. |
| Udi | 1081 | | 15 |
| Udiartea | 1007 | | 6 |
| Ugagibel | 1229 | | 24 |
| Ugarra | 854 | | 27 |
| Ugarron | 730 | | 7 |
| Ugarte | 629 | | 5 |
| Ukerdi | 2251 | | 48 |
| Ukua | 1061 | Labia | 13 |
| Ulizar | 867 | | 37 |
| Umandia | 1224 | | 50 |
| Umión | 1434 | | 26 |
| Unanua | 651 | | 10 |
| Unbe | 302 | | 8 |
| Unboto | 796 | | 24 |
| Unesa | 993 | | 4 |
| Ungino | 1105 | Garobel / Sálvada | 58 |
| Untzillatx | 934 | Durangaldea | 36 |
| Untzueko haitza | 990 | Alaitz | 22 |
| Untzueta | 766 | Mendigisa | 18 |
| Unzanos | 734 | | 5 |
| Upo | 567 | | 28 |
| Upo | 608 | Gorbeia | 7 |
| Urakorri | 1306 | Aralar | 40 |
| Urdaburu | 598 | | 106 |
| Urdanatz / Erbilarreta | 1118 | | 27 |
| Urdanegi | 1132 | | 8 |
| Urdani | 855 | | 7 |
| Urdantxi | 749 | | 4 |
| Urdazkain | 899 | | 7 |
| Urdelar | 852 | | 42 |
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