Ezo

Ezo in Big Bang Age
Ezo is one of the territories in the Hokkaido area during the National Stage. It is initially under the control of Nightmare Eyes.

Ezo in Sengoku Rance
Ezo is one of the territories in JAPAN. It is equivalent to the Hokkaido of real world Japan.

It is adjacent to Oshu, and is under the control of the One Eyed House.

Trivia
Ezo is a term used in the past to refer to the land and the people of Hokkaido. See Ezo or 蝦夷