The term German Spa City is composed of three crossword solutions: BADEN (5 letters), AACHEN (6 letters), and Badenbaden (10 letters). BADEN is a city in the state of BADEN-Württemberg, Germany, located on the western bank of the River Rhine. It is known for its hot springs and Roman ruins. AACHEN is a city in North Rhine-Westphalia, Germany, located near the Dutch and Belgian borders. It is known for its historic architecture and thermal baths. Badenbaden is a spa town in BADEN-Württemberg, Germany, located in the Black Forest. It is known for its hot springs, Roman baths, and casino.