Tsumagoi is a village located in Gunma Prefecture, Japan. As of 1 September 2020, the village had an estimated population of 9,546 in 3,999 households, and a population density of 28 persons per km². The total area of the village is 337.51 square kilometres (130.31 sq mi).

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.