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Alstera, německy Alster, je řeka v Holštýnsku, pravobřežní přítok Labe, s nímž se slévá v Hamburku. Pramení u obce Henstedt-Ulzburg, je dlouhá 56 km a na svém dolním toku vytváří dvě jezera: větší Vnější Alsteru (Außenalster) a menší Vnitřní Alsteru (Binnenalster).
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53 32 commons 56 km toku 45 48 96 10 17 28 40 59 datové položky wikimedia holštýnsku labe hamburku
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Alstera | Délka toku | 56 km | 1.00 | infobox |
| Alstera | OpenStreetMap | OSM, WMF | 1.00 | infobox |
| Alstera | Plocha povodí | 580,7 km² | 1.00 | infobox |
| Alstera | related to Externí odkazy | Obrázky | 0.60 | section |
| Alstera | related to Externí odkazy | Wikimedia Commons | 0.60 | section |
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