Nestled amidst the volcanic peaks of Gunma Prefecture, Kusatsu Onsen is a haven for relaxation and rejuvenation. Renowned for its abundant, steaming hot springs and charming mountain atmosphere, this historic resort town attracts millions of visitors each year seeking a unique and revitalizing experience.
A Legacy of Healing Waters
Kusatsu Onsen boasts the largest volume of naturally flowing hot spring water in all of Japan. The source of this thermal bounty lies beneath the iconic Yubatake, a vast, emerald-hued hot water field that steams in the heart of the town. The water itself is unique, characterized by its high acidity and temperature (around 55°C), making it unsuitable for direct bathing. However, after a complex cooling and dilution process, it becomes the soul of Kusatsu’s numerous public and private baths, known as “onsen.”

These onsen have been revered for centuries for their therapeutic properties. Legend has it that even shoguns had the water transported to Edo (present-day Tokyo) for its curative powers. Modern science supports these claims, with studies suggesting the water’s high acidity effectively cleanses and soothes various skin conditions.
While indulging in the onsen is undoubtedly the centerpiece of a Kusatsu Onsen experience, the town offers much more. Picturesque wooden inns line narrow streets, their traditional architecture echoing the town’s rich history. Souvenir shops peddle local crafts and delicious regional treats, while charming cafes and restaurants invite weary travelers to refuel.
Beyond the Bath
For those seeking adventure, the surrounding mountains provide ample opportunities for exploration. Hiking trails wind through verdant forests, leading to scenic overlooks and hidden waterfalls. In winter, the Kusatsu Kokusai Ski Resort transforms the landscape into a snowy wonderland, perfect for skiers and snowboarders of all levels.

Unforgettable Experiences in Kusatsu Onsen
Kusatsu Onsen offers a variety of onsen experiences to cater to different preferences. Public bathhouses, like Saito Hotel Goyo-kan and Netta no Yu, provide a communal and social atmosphere, perfect for immersing yourself in local culture. Private onsen, offered by many ryokan (traditional inns), allow for a more intimate and luxurious experience.
One unique tradition is the “yumomi,” where attendants in white uniforms stir the steaming water in the Yubatake to adjust its temperature. Witnessing this centuries-old practice adds another layer of cultural immersion to your visit.

Planning Your Steamy Escape
Kusatsu Onsen is accessible by train or bus from major cities like Tokyo and Osaka. The best time to visit depends on your preference. Spring offers vibrant landscapes, while summer brings cooler temperatures and lively festivals. Autumn paints the mountains in fiery hues, and winter transforms the town into a snowy wonderland.
Accommodation options range from traditional ryokan to modern hotels, catering to various budgets and styles. Be sure to book your stay in advance, especially during peak seasons.
A Final Soak in Kusatsu Onsen
Kusatsu Onsen is more than just a hot spring resort; it’s a cultural immersion, a scenic escape, and a gateway to relaxation. Whether you seek to soothe your body, explore the natural beauty, or simply soak in the unique atmosphere, Kusatsu Onsen has something to offer everyone. So, pack your swimsuit, embrace the steam, and let the healing waters of Kusatsu work their magic.
Don’t miss another astonishing location: Takaragawa Onsen is probably my favorite onsen destination!
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