9. Kusatsu Visitor CenterKusatsu Machi Kusatsu is a town located in Gunma Prefecture, Japan. As of February 2015, the town had an estimated population of 6,537, and a population density of 131 persons per km². Its total area is 49.75 km². Kusatsu is one of the most famous hot springs resorts in Japan. From Wikipedia, the free encyclopedia.