Oga Aquarium 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.

Oga is a city located in Akita Prefecture, Japan. As of 28 February 2023, the city has an estimated population of 24,687 in 12,496 households, and a population density of 100 persons per km2. The total area of the city is 240.80 square kilometres (92.97 sq mi).