Nihonmatsu is a city in Fukushima Prefecture, Japan. As of 1 April 2020, the city has an estimated population of 54,013 in 20,179 households, and a population density of 160 persons per km2. The total area of the city was 344.42 square kilometres (132.98 sq mi). The Adachi neighborhood of Nihonmatsu was the birthplace of artist Chieko Takamura, subject of the book of poems Chieko's Sky , written by her husband Kōtarō Takamura.

Fukushima Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. Fukushima Prefecture has a population of 1,771,100 and has a geographic area of 13,783.90 square kilometres (5,321.99 sq mi). Fukushima Prefecture borders Miyagi Prefecture and Yamagata Prefecture to the north, Niigata Prefecture to the west, Gunma Prefecture to the southwest, and Tochigi Prefecture and Ibaraki Prefecture to the south.