Kusatsu Onsen boasts the largest amount of natural spring water in Japan, with more than 32,300 liters of hot spring water gushing out every minute. The spring quality is an acidic spring, and it has a high bactericidal effect, and is said to be effective for rough skin and neuralgia.

The biggest feature of Kusatsu Onsen is its steam. More than 4,000 liters of hot spring water gushes out every minute from a place called Yubatake, and steam is constantly rising. Steam is a symbol of Kusatsu Onsen and is visited by many tourists.

In addition to the hot water field, Kusatsu Onsen also has a variety of attractions such as the Yumomi and the open-air bath in the hot water field.