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The "Spreewald" is a picturesque section of the German state of Brandenburg located about 100 km south-east of Berlin. Spreewald was designated a biosphere reserve by UNESCO in 1991. It is known for its traditional irrigation system, consisting of more than 200 small canals (called "Fließe"; total length: 1,300 km ) within the 484-square-kilometre area. Origin: wikipedia