Aqua World (アクアワールド・大洗, Akua Wārudo Oarai), formerly the Ibaraki Prefectural Oarai Aquarium (茨城県大洗水族館, Ibaraki-ken Oarai suizokukan), is a 19,800 square metres (213,000 sq ft) aquarium in the Higashiibaraki District of Ibaraki Prefecture, Japan, North of Oarai port at the mouth of the Naka River. We are focusing on displaying sharks, and 59 types of sharks live in the aquarium. Many varieties of sea species, especially fish, can be found in Aqua World. The fee for entry varies according to the age group.