In recent years, hot springs have been used for regional revitalization. Oita Prefecture, which has the largest number of hot spring sources in the country, applied to trademark the phrase "Onsen-ken" (onsen prefecture) in 2012. In consideration of other prefectures with famous hot springs, the registration was settled as "Onsen-ken Oita." In 2018, members of the prefectural assembly in Gunma Prefecture formed a study group to pursue Intangible Cultural Heritage registration for hot springs. Gov. Ichita Yamamoto spearheaded the establishment of a governors' association in support of the hot spring registration and, as its secretary general, led the lobbying of the government. In November last year, the government's Council for Cultural Affairs evaluated the practice of bathing in hot spring water, concluding that it is a "social custom deeply rooted in the Japanese people," stating that it "relaxes the mind and heals the body through its therapeutic effects." The council selected hot springs for registration after successfully registering the "kagura" theatrical tradition.