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Trettach. Trettach is km long river in the Allgu Alps in southwest Bavaria Germany View of the Trettach south of Oberstdorf near Gruben Trettach ist ein km langer Fluss in den Allguer Alpen im sdwestlichen Bayern Deutschland Im Bild Die Trettach sdlich von Oberstdorf bei Gruben own Nikater Own work all rights released Public domain