Oga Aquarium Gao (男鹿水族館ガオ, Oga Suizokukan Gao), officially Akita Prefectural Oga Aquarium, is an aquarium located along Oga Peninsula coast, Oga, Akita Prefecture, Japan. GAO stands for Globe, Aqua and Ocean, and sounds like an Oga-native Namahage shout.