Catchments
| Name | Type |
|---|---|
| Agüero (22004) | administrative |
| Agugliano (042001) | administrative |
| Agugliaro (024001) | administrative |
| Aguilafuente (40004) | administrative |
| Aguilar de Bureba (09007) | administrative |
| Aguilar de Campoo (34004) | administrative |
| Aguilar de Campos (47003) | administrative |
| Aguilar de Codés (31008) | administrative |
| Aguilar de la Frontera (14002) | administrative |
| Aguilar del Alfambra (44005) | administrative |
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