Okinawa Churaumi Aquarium (沖縄美ら海水族館) 沖縄美ら海水族館
The tank's glass is 60 cm thick and weighs 135 tonnes: the tank holds 7,500 m³ of water.
An aquarium in Motobu, inside the Ocean Expo Commemorative Park.
Okinawa
Kinen Koen mae, ロイヤルビューホテル美ら海(上り), Okinawa Churaumi
Jujutsu Kaisen
The large ‘Kuroshio Sea’ tank is where Satoru Gojō and Suguru Getō go on their outing in the ‘Hidden Inventory’ arc (episode 27). In the same park, a few hundred metres away, the ‘water staircase’, from which you can see the outline of Ie Island, is another shot from the same episode.
All the places from Jujutsu Kaisen
https://theanimetrip.com/luoghi/acquario-churaumi-di-okinawa