The Georgia Aquarium Is the Largest in the United States, But Not Globally

The Georgia Aquarium in Atlanta held the title of world's largest aquarium when it opened in 2005. However, it lost that ranking in 2012 when the Marine Life Park opened in Singapore. Today, the Georgia Aquarium ranks as the second-largest by total water volume, holding approximately 11 million gallons. The Marine Life Park in Singapore now holds the top position with roughly 40 million gallons across its entire facility, though some sources measure differently depending on whether they count connected systems or individual tanks.

The distinction matters because different aquariums measure size in different ways. Some count only the main tank, others include all connected exhibits, and a few measure by the number of animals rather than water volume. This means you may see conflicting claims online depending on the measurement method used.

Key Takeaways

  • The Georgia Aquarium is the largest aquarium in the United States by water volume, with approximately 11 million gallons.
  • The Marine Life Park in Singapore surpassed the Georgia Aquarium as the world's largest in 2012 and holds roughly 40 million gallons.
  • Different aquariums measure size using different methods—some count only main tanks while others include all exhibits—which can create confusion about rankings.
  • The Georgia Aquarium remains one of the most visited aquariums in the world despite no longer holding the largest title.
  • Several other major aquariums worldwide have comparable or larger water volumes depending on how size is measured.

How the Georgia Aquarium Compares to Other Major Facilities

When the Georgia Aquarium opened on September 30, 2005, it was genuinely the largest aquarium on Earth by water volume. The facility cost $290 million to build and was designed to showcase marine life from around the world. At that time, no other aquarium came close to its 11 million gallons of water spread across multiple exhibits.

The Marine Life Park in Singapore changed that ranking seven years later. This facility combines multiple connected tank systems and is often cited as having between 40 and 60 million gallons depending on the source. Other large aquariums that compete for top rankings include the Okinawa Churaumi Aquarium in Japan, which holds approximately 7.5 million gallons, and the Monterey Bay Aquarium in California, which holds roughly 750,000 gallons in its main building.

Why Size Measurements Vary Between Aquariums

Aquariums report their size using different standards, which is why you may see conflicting information. Some facilities count only their largest or most famous tank, while others add up every tank in the building, including small exhibits and holding areas. A few measure by the number of animals housed rather than water volume at all.

The Georgia Aquarium typically reports 11 million gallons, which includes its main Ocean Voyager tank (6.3 million gallons alone) plus all connected exhibits. The Marine Life Park counts its total water volume across all systems. Without knowing each facility's measurement method, it is difficult to make a direct comparison. This is why different websites sometimes list different aquariums as "the largest"—they are using different definitions of size.

What Makes the Georgia Aquarium Notable Today

Even though the Georgia Aquarium is no longer the world's largest, it remains one of the most visited aquariums globally. The facility draws over 10 million visitors annually and is known for its whale shark exhibits, beluga whales, and diverse collection of marine species. It continues to be a major tourist attraction in Atlanta and a significant research and conservation facility.

The Georgia Aquarium also pioneered several exhibit designs and animal care practices that other aquariums have since adopted. Its influence on the aquarium industry extends beyond its size ranking. The facility regularly updates its exhibits and adds new species, keeping it competitive with newer facilities despite its age.

Other Contenders for World's Largest Aquarium

Beyond the Marine Life Park and Georgia Aquarium, several other facilities claim to be among the world's largest depending on how size is measured. The Okinawa Churaumi Aquarium in Japan is frequently listed in top rankings and is known for its massive Kuroshio tank. The Monterey Bay Aquarium in California, while smaller by total volume, is considered one of the most prestigious and influential aquariums in the world.

China has also built several very large aquariums in recent years, including the Chimelong Ocean Kingdom in Guangdong Province. These newer facilities sometimes report larger water volumes than the Georgia Aquarium, though exact figures can be difficult to verify. The competition for "largest aquarium" status continues to shift as new facilities open and measurement standards evolve.

How the Georgia Aquarium Measures Its Size

The Georgia Aquarium's 11 million gallons figure comes from adding up all water in the facility. The Ocean Voyager tank accounts for 6.3 million gallons of that total and is the main draw for visitors. The remaining 4.7 million gallons are distributed across numerous other exhibits, including the Tropical Diver, River Scout, Cold Water Quest, and Beluga whale habitats.

This comprehensive counting method is standard for the Georgia Aquarium's official reporting. When comparing it to other facilities, remember that some aquariums may count differently. The Marine Life Park in Singapore, for example, sometimes reports figures that include water in pipes and filtration systems, which inflates the total compared to facilities that count only display tanks.

Frequently Asked Questions

When did the Georgia Aquarium stop being the world's largest?

The Georgia Aquarium held the title from its opening in 2005 until 2012, when the Marine Life Park opened in Singapore. The Marine Life Park's larger total water volume made it the new record holder. The Georgia Aquarium has remained the largest in the United States since then.

How many gallons of water does the Georgia Aquarium hold?

The Georgia Aquarium holds approximately 11 million gallons of water across all its exhibits. The Ocean Voyager tank alone contains 6.3 million gallons. This figure includes all connected tanks and exhibits throughout the facility.

Is the Georgia Aquarium still worth visiting if it is not the largest?

Yes. The Georgia Aquarium draws over 10 million visitors annually and is known for specific exhibits like its whale sharks and beluga whales. Size alone does not determine the quality of an aquarium experience. Many visitors consider it one of the best aquariums to visit regardless of its ranking.

What aquarium is actually the largest in the world?

The Marine Life Park in Singapore is generally recognized as the world's largest by water volume, with approximately 40 million gallons. However, some sources cite different figures depending on whether they count all connected systems or only main display tanks.

Could the Georgia Aquarium become the largest again?

It is unlikely unless the facility undergoes a major expansion. The Marine Life Park and other newer facilities have larger water volumes, and new aquariums continue to be built worldwide. The Georgia Aquarium remains focused on conservation and education rather than competing for size records.