In Ginga: Nagareboshi Gin, the Ōu region used to be a part of Akakabuto's territory, but is now under the reign of the Ōu Army. Since Akakabuto was defeated Ōu is known as the dog paradise.
This region is quite peaceful but has a famous landmark called Gajō. It has been the stronghold of the antagonists Akakabuto, Kaibutsu, Hōgen and now Monsoon.
The Ōu Mountains (奥羽山脈 ,Ōu-sanmyaku) are a real mountain range in the Tōhoku region of Honshū, Japan. The range is the longest range in Japan and stretch 500 km (311 mi) south from the Natsudomari Peninsula of Aomori Prefecture to the Nasu volcanoes at the northern boundary of the Kantō region. Though long, the range is only about 35 kilometres (22 mi) wide. The highest point in the range is Mount Iwate, 2,038 metres (6,690 ft).