Kusatsu is a town located in Gunma Prefecture, Japan. In September 2020, the town had a population of 6,255, in 3,407 households, and a population density of 130 persons per km2. The total area of the town is 249.75 square kilometres (96.43 sq mi). Kusatsu is one of the most famous hot springs resorts in Japan.

Gunma Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 and has a geographic area of 6,362 km2. Gunma Prefecture borders Niigata Prefecture and Fukushima Prefecture to the north, Nagano Prefecture to the southwest, Saitama Prefecture to the south, and Tochigi Prefecture to the east.