Nasushiobara is a city located in Tochigi Prefecture, Japan. As of 1 August 2020, the city had an estimated population of 115,794 in 48,437 households, and a population density of 67 persons per km². The total area of the city is 592.74 square kilometres (228.86 sq mi).

Tochigi Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Tochigi Prefecture has a population of 1,897,649 and has a geographic area of 6,408 km². Tochigi Prefecture borders Fukushima Prefecture to the north, Gunma Prefecture to the west, Saitama Prefecture to the south, and Ibaraki Prefecture to the southeast.