Treysa, which has been an independent city up to 1970, is the biggest district of the German city Schwalmstadt. It was incorporated into Schwalmstadt in December 1970.
The location around Treysa and Schwalmstadt is called Schwalm. The historic city lies on a hill which is up to 35 meters higher than the valley where the river Wiera enters in the Schwalm. To protect the city of floods, a detention basin had been built.
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