Guide
Kusatsu Onsen is a world-class hot spring resort located in Kusatsu Town, Agatsuma District, Gunma Prefecture. It is renowned for its massive natural water discharge, recording over 32,300 liters per minute, which draws travelers from across the globe. Situated at an altitude of 1,100 to 1,200 meters, the area offers a refreshing atmosphere with the majestic Mt. Kusatsu-Shirane rising to the northwest. The water is characterized by its highly acidic properties (pH level of approximately 2.0), which is believed to have high sterilization effects and serves as a cornerstone of the local culture and scenery.
The history of Kusatsu Onsen is incredibly deep, with records dating back to the Muromachi period when it was already recognized as one of the three most famous hot springs in Japan. During the Edo period, it held the prestigious rank of 'Ozeki' (the highest classification) in the hot spring rankings. One of its most iconic traditions is 'Yumomi'—the art of cooling the hot water by stirring it with wooden boards while singing traditional songs. The very name 'Kusatsu' is thought to derive from 'Kusamizu' (smelly water) or 'Kusato,' reflecting the distinct scent of sulfur that has been part of the town's identity for centuries.
The heart of the town is the 'Yubatake' (Hot Water Field). This central landmark is a circular facility where you can witness the process of cooling the high-temperature spring water and collecting 'Yuna no Hana' (mineral crystals). Another must-visit is 'Nishi-no-Kawara Park,' where you can stroll along a scenic path and observe the hot springs bubbling up from the earth. Other points of interest include the 'Shirahata' area and the historic Jizo surroundings, all of which allow you to feel the dynamic energy of the geothermal springs.
Kusatsu Onsen is beautiful year-round, but each season offers a unique charm. The Yubatake area is particularly magical at night when it is illuminated, creating a dreamlike atmosphere. Because of its high altitude, you can also experience the beauty of hot springs surrounded by heavy snow in the winter. Whether it is the vibrant greenery of summer or the snowy landscapes of winter, the scenery changes beautifully with the seasons.
Visitors can experience the traditional 'Yumomi' culture firsthand. Many local inns also offer 'uchiyu-meguri' (public bath hopping) services, allowing you to experience different types of spring water from various establishments. You may also find 'Te-arai no Yu' stations throughout the town, where you can wash your hands in the mineral-rich water as part of a daily ritual. Exploring the streets allows for a profound connection with the local hot spring culture.
The area is surrounded by the natural splendor of Mt. Kusatsu-Shirane, part of the Joshin'ai-Kogen National Park. This provides a stunning backdrop of mountain scenery that complements the hot spring experience. Seasonal buses are available to help you access nearby scenic spots and mountain trails.
Comfortable walking shoes are highly recommended for exploring the town's slopes. Since the water is highly acidic and temperatures can vary, it is wise to bring a change of clothes and towels. Please follow all local rules when visiting bathing facilities.