Catchments
| Name | Type |
|---|---|
| Ahrenviölfeld (01054004) | administrative |
| Ahrweiler (DEB12) | nuts |
| Aia (20016) | administrative |
| Aibar / Oibar (31009) | administrative |
| Aichach-Friedberg (DE275) | nuts |
| Aichach, St (09771113) | administrative |
| Aicha vorm Wald (09275111) | administrative |
| Aichelberg (08117002) | administrative |
| Aichen (09774166) | administrative |
| Aichhalden (08325001) | administrative |
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