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EHMK
| Nombre | Altitud | Zone | Ph. |
| Illarragorri / Irumuga | 1118 | Altzania | 46 |
| Illarraundiko malkorra | 1064 | Aralar | 21 |
| Illon | 1283 | Illon | 15 |
| Illunbe | 447 | | 16 |
| Illuntzar | 727 | | 28 |
| Ilso / Eguen | 564 | Santxosolo | 23 |
| Indamendi | 461 | | 36 |
| Indiagana | 1101 | Gasteiz mendiak | 18 |
| Infierno | 3082 | Infierno | 23 |
| Intsusburu | 943 | Altzania | 29 |
| Intxorta | 737 | | 52 |
| Intzako Dorrea | 1431 | Aralar | 58 |
| Iparla | 1044 | | 28 |
| Ipizte | 1062 | Arangio | 48 |
| Ipuliño | 930 | | 37 |
| Irakurri | 1142 | | 34 |
| Iramendi | 866 | | 25 |
| Iramendi / Amutz | 1206 | | 19 |
| Iraututurru | 1152 | | 16 |
| Ireber | 1204 | | 62 |
| Irimo | 896 | | 60 |
| Irukurutzeta | 899 | | 88 |
| Irulegi | 893 | Aranguren | 28 |
| Iruñarri | 1051 | | 37 |
| Iruntxur | 743 | | 21 |
| Irutontorreta | 621 | | 34 |
| Isterbegi | 1027 | | 17 |
| Ituiñomendi | 400 | | 9 |
| Iturrigorri | 1066 | Garobel / Sálvada | 107 |
| Itxogana | 1062 | Gasteiz mendiak | 22 |
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