One of Japan’s best three hot springs


Located about 200 kilometers north-northwest of Tokyo, Kusatsu Onsen is a small town nestled in mountains where visitors can experience nature all year round.

Although its population is only around 7,000, it welcomes some three million tourists every year. Click here for detailed

information on Kusatsu Hot Spring, one Japan’s best three hot springs found in the center of the town of Kusatsu.


Acidic spring water containing sulfur, aluminum sulfate and chloride


Relief of neuralgia, muscular and arthritic pain, skin ailments, stiff shoulders, bruises, sprains, chronic fatigue, chronic women’s diseases, diabetes, high blood pressure and hardening of the arteries; promotion of general health and convalescence, etc.


The yubatake is the symbol of Kusatsu. Here, hot water from the spring’s origin gushes down wooden channels made from five-centimeter thick pinewood still containing large amounts of resin. Fine quality pinewood or Japanese cypress rich in resin is the optimum choice of material to continuously withstand acidic spring water. This is why many inns still have old, wooden bathtubs made of similar materials. Thus, the quality of Kusatsu’s spring water also serves to create a typically rustic hot spring atmosphere.


Kusatsu Onsen boasts the largest natural output of any hot spring in Japan.Trails of steam seen rising into the air all over the town enhance any traveler’s experience. Let’s take a look at this incredible amount of water that enables the continuous flow of the natural hot spring.Kusatsu Onsen is rightfully proud of both the quality and quantity of its waters.

Unmatched Quality and Quantity

In Kusatsu, more than 32,000 liters of spring water gush out every minute – the equivalent of some 230,000 barrels per day. The spring’s source is Mt. Shirane, an active volcano. This makes it possible for all Japanese style inns, hotels and spa facilities in Kusatsu Onsen to continuously provide their guests with spring water that doesn’t need to be reheated, diluted or otherwise adjusted. This lavish amount of water allows visitors to have a luxuriously sensational experience.

Fruits of the plentiful waters

Yubatake – “a field of hot water” – is the symbol of Kusatsu. Here, something called yu-no-hana (literally “sulfur flowers” or mineral salts) is formed when the massive quantities of spring water are exposed to the air. This natural bath salt is removed from wooden tubs four times a year while the water flow is temporarily halted. Carefully removed by hand, the bath salts are packaged in cone-shaped containers, whose annual production totals only seven to eight thousand.


At this traditional bathhouse, visitors can see demonstrations of yumomi and traditional dance done to a local folk song. A few members of the audience will be selected to try yumomi and will receive a certificate and complimentary gift. In the evening, traditional ”rakugo” comic storytelling performances are give here.

The hot springs in Kusatsu are put to various uses. In order to lower the temperature of the scalding hot Bandai hot spring to a temperature suited to bathing without diluting the water, a heat exchanger is used to pour cold tap water on the pipe through which the spring water flows. The tap water, which rises in temperature during the process, is then used to melt snow on roads and is supplied as hot water to Japanese style inns and private homes.

Another example is spring water that flows into the Yukawa River, which is neutralized with natural coal to maintain an environment suitable for fish. These are all facets of Kusatsu’s philosophy of “onsenism,” principles to maintain the quality of our hot springs.



Adventure into the ever-changing natural surroundings of Kusatsu in the winter!

Experience the untouched wonders of nature on this course, which gives participants a chance to enjoy the thrill of skiing as it was original done.


Situated on the west side of Kusatsu, this huge area has numerous wells from which hot water springs out to form a flowing river of hot water amongst large clouds of steam. Legend says a demon lives here, and visitors should not speak loudly or the demon will appear.