Kusatsu is a famous hot spring resort located in Nagano Prefecture, Japan. Known for its high-quality sulfuric waters, it is one of the most popular onsen (hot spring) destinations in the country. The town features a unique yubatake, or "hot water field," where steaming water flows down wooden structures, showcasing the natural beauty of the area. Visitors to Kusatsu can enjoy various public baths and ryokan (traditional inns) that offer onsen experiences. The therapeutic properties of the mineral-rich waters are believed to help with various ailments, making it a sought-after destination for relaxation and wellness.