Kuroshio Sea

The second largest aquarium in the world is in Japan.
The main tank called the "Kuroshio Sea" holds 7,500-cubic meters (1,981,290 gallons) of water and features the world's second largest acrylic glass panel, measuring 8.2 meters by 22.5 meters with a thickness of 60 centimeters. Whale sharks and manta rays are kept amongst many other fish species in the main tank.
By the way, this was shot using a Canon 5D Mark II. I've been wanting this camera for a while now.