Buk [buk] (German: Buchenstadt) is a town in central Poland, situated in the Greater Poland Voivodeship (since 1999), previously in Poznań Voivodeship (1975–1998).The town's name means "Beech" in Polish, and the flag of the town shows a branch of beech, and three beech leaves.The legend says that near city, under beech tree first ruler of Poland "Mieszko I" died.