伊勢湾
Ohama operated as a pirate chief in the area that is present-day Ohama-cho in Toba, Mie Prefecture. He held great power in the Ise Bay area as well as being very influential over the Kitabatake clan, which held the governorship of the Ise Province. Ohama controlled the Kitabatake family's pirates and owned an atakebune, but was defeated by Kuki Yoshitaka, who had allied with Oda Nobunaga in his bid to unify Shima Province. Subsequently, Ise Bay was overrun.