Klosterwasser (Upper Sorbian: Klóšterska woda, pronounced [ˈklʊʃtɛʁska ˈwɔda]) is a river of Saxony, Germany.

It is a right tributary of the Black Elster, which it joins near Wittichenau.

The source of the Klosterwasser/Klóšterska woda is located in Burkau/Porchow, Germany, in the Lusatian Highlands (Lausitzer Bergland) near the Czech border.

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