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.

The town's landmark is the so-called Totenkirche, which has been earlier called Martinskirche and had been built in 1230.

After the death of the last count of Ziegenhain, the complete countship entered into possession of the Landgraviate of Hesse.

In August 1945, there had been conferences about the founding of the Evangelical Church in Germany in Treysa.

Treysa station is on the Main to Weser railway from Frankfurt to Kassel.