located just of the shore of Onna in Okinawa, Japan. there is a small island called Dolphin island or Hiituu shima(ヒート ウー島)in the native okinawa dialect. unfortunately very little is known about this island, it is said to have been a restaurant and aquarium that was built in the 50’s. It never opened though, some say it was shut down due to permit issues and others say the owner died before it could open.
沖縄の海岸にある廃墟の島を探検してください。
AloJapan.com