The Ōu Mountains are located in the northeastern part of Japan, and they form a natural boundary between the Tōhoku region and the Kanto region. The range is divided into two parts: the northern Ōu Mountains and the southern Ōu Mountains. The northern Ōu Mountains are located in Aomori Prefecture and Iwate Prefecture, and they include the Hakkoda Mountains and the Iwate Mountains. The southern Ōu Mountains are located in Miyagi Prefecture, Yamagata Prefecture, and Fukushima Prefecture, and they include the Zao Mountains and the Azuma Mountains.
The Ōu Mountains are a popular destination for hiking and camping. The range offers stunning scenery, and there are many hot springs and other natural attractions. The Ōu Mountains are also home to a variety of wildlife, including bears, deer, and monkeys.