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The Drentsche Aa is a river rising in the Dutch province of Drenthe, flowing through Drenthe and for the last part the province of Groningen. It ends in the Schipsloot near Haren, which flows into the Noord-Willemskanaal; however, originally it ended into the Selwerderdiep. The water finally ends in the Lauwersmeer and Waddenzee.
Data from: en.wikipedia.org