阿武隈川
Running through Motomiya, the Abukuma River divides the city in two. On the former Motomiya Town side, bordered by the Ōu Mountains (including Mount Adatara) in the west, and the Abukuma River in the east, flat plains run north to south extending into the Kōriyama Basin. The mountains to the north in Ōtama Village and Kōriyama serve as the sources for several rivers and streams including the Hyakunichi River (百日川), Adatara River (安達太良川), Seto River (瀬戸川), and Gohyaku River (五百川). The Hyakunichi River and Adatara River share the same source but diverge downstream. The former Shirasawa Village is surrounded by gentle rolling hills.