The largest aquarium in the world. The Guinness Book of World Records confirmed Monday that Chimelong Ocean Kingdom set five world records, including claiming the title of the largest aquarium in the world. Chimelong Ocean Kingdom also hold the records for "largest underwater viewing dome, largest aquarium tank, largest aquarium window and largest acrylic panel," Guinness Book of World Records reports. The aquarium boasts a total water volume of 12.87 million gallons. Chimelong Ocean Kingdom, World's Largest Aquarium, Opens In China Google Images. Now that is something I would love to see in my life time.