Declension of the word "altwasser"

Singular and plural for Altwasser, n, strong declension     translation to English backwater

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Altwasser
die Altwasser / Altwässer
Genitiv (Wessen?)
des Altwassers
der Altwasser / Altwässer
Dativ (Wem?)
dem Altwasser
den Altwassern / Altwässern
Akkusativ (Wen? Was?)
das Altwasser
die Altwasser / Altwässer
Plural
die Altwasser / Altwässer
der Altwasser / Altwässer
den Altwassern / Altwässern
die Altwasser / Altwässer
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