Catchments
| Name | Type |
|---|---|
| Aitern (08336004) | administrative |
| Aitoloakarnania (EL631) | nuts |
| Aitona (25038) | administrative |
| Aitrach (08436004) | administrative |
| Aitrang (09777111) | administrative |
| Aizarnazabal (20003) | administrative |
| Ajalvir (28002) | administrative |
| Ajamil de Cameros (26004) | administrative |
| Ajangiz (48911) | administrative |
| Ajofrín (45001) | administrative |
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