Kusatsu

Kusatsu features Japan's most acidic springs with a pH of 2.1, creating powerful therapeutic waters that flow at 4,000 liters per minute from the symbolic yubatake hot water field. At 1,200 meters elevation in Gunma Prefecture, this town maintains year-round bathing with snow season temperatures averaging -5°C, making 50°C soaks particularly invigorating. Kusatsu outperforms #4 Kinosaki in natural mineral intensity, offering a 30% higher concentration of hydrogen ions for skin and joint treatments. The town's three public bathhouses serve over 1.2 million visitors yearly, with entry fees kept 20% below the national average at just 600 yen. Local ryokan report 85% occupancy rates during peak winter months.