Grenzaa or Schoonebeker Diep is a river on the border of Lower Saxony, Germany and Drenthe, Netherlands, near the town Twist.

It forms some of the border between the Netherlands and Germany.

[1] Through the Coevorden-Piccardie-Kanal and the Coevorden-Vechtkanaal it discharges into the Vechte near Coevorden.

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