Wetter Bad Sooden-Allendorf is a town in the Hersfeld-Rotenburg district, in Hesse, Germany. It is situated on the Werra river, approximately 35 kilometers (22 miles) southwest of Kassel.
The town is known for its thermal springs, which have been used for therapeutic purposes since the 16th century. The springs are rich in minerals, including calcium, magnesium, and sodium, and are said to have healing properties for a variety of ailments, including rheumatism, arthritis, and skin diseases.