Biggest Indoor Swimming Pool in the World: A Simple Guide
Superlatives are popular with human beings: the largest, the tallest, the deepest. ‘Biggest’ can mean something different in the case of indoor swimming pools, where surface area, length, volume, depth, or even the size of the entire indoor water park can be considered. The competitors are described below, noting how individuals define big need, how the actual ones are compared, and step-by-step advice is provided to visit, along with frequently asked questions. Short English, straightforward headings, bullet points and a comparison table can be inserted in your blog at the drop of a hat.

What “biggest” actually means
We should first make a decision about what we mean by ‘biggest’ before we settle on who the winner is. Common measures:
Surface area (square metres): the area that the pool floor covers.
Length (metres): maximum distance swimming.
Volume (cubic metres): this refers to the quantity of water which the pool is retaining.
Depth: deepest point (only speciality pools).
Footprint of facilities: the size of the whole indoor water park (not the pool only).
The measuring of various records is different; hence, what might be considered to be the largest pool in one record list might not be the largest in another record list.
Historic champion: Seagaia Ocean Dome (Japan) — once the biggest
- Where: Miyazaki, Japan.
Famousness: Ocean Dome (or Seagaia Ocean Dome) was designed in 1993 and was, over a few years, said and written to be the largest indoor beach/wave pool on the planet, with an adjustable roof of about 300m x 100 m.
It contained a man-made beach of sand, wave generators and even a show of an erupting volcano. The building was later destroyed in 2007, though the dome is still a pioneer in terms of the volume of an indoor pool.
Modern record holder (Guinness): Ashgabat Olympic Watersports Complex (Turkmenistan)
- When: Ashgabat, Turkmenistan.
According to Guinness World Records, in 2017, the water complex in Asher Tartar Olympic Village was added to the Guinness World Records as the world’s largest aquatics sports park with a total pool area of 4,976.65 m² (the total pool surface area in their complex). The facility has several competition pools and seating.
Biggest indoor waterpark you can still visit: Tropical Islands (Germany)
- Where: Krausnick, Germany (Berlin area).
What it is: Tropical Islands is the world’s largest indoor water park and tropical resort situated in an airship hangar. Its principal lagoon is the so-called Tropical Sea, which is roughly 4,000-4,400 m² (e.g., 4 Olympic pools), and the total area of the whole facility is gigantic (hundreds of thousands of square feet). It is a tourist attraction and is operating throughout the entire year on a year-round basis.
How to check which pool is the “biggest” — step-by-step (for bloggers/researchers)
- Choose your measure: area, length, volume or depth.
- Note the closures: large historic pools (such as Ocean Dome) can be closed – opening/closing dates.
- Cite: never fail to provide the authority in your blog (the Guinness official site or a large news resource).
- Be specific in your headline: e.g., ‘Biggest indoor water pool by surface area’ or ‘Biggest indoor water park is open today’. That avoids confusion.
Visitor tips: if you want to see one of these pools
Tropical Islands (Germany)
o Families and tourists are most suitable – indoor beach, slides, restaurants.
o Purchase tickets via their official website.
The Ashgabat Complex (Turkmenistan)
- It may be restricted access (state venues). Check visa and local access regulations according to official sources, Guinness recognition.
- When you are seeking more than an ordinary pool experience, go to Y-40 in Italy and jump instead of floating.

FAQs
Q: Is Seagaia Ocean Dome still open?
A: No – the dome building was torn down in 2017, but the Ocean Dome shut down in 2007. It is a historical landmark that one cannot visit.
Q: How do clean water and heating work in enormous indoor pools?
A: To maintain the safety and comfort of water in large indoor pools, industrial filtration (sand/cartridge/UV), circulation systems, and heating plants are utilised. In the case of wave pools or artificial beaches, specialised pump and wave generation equipment is in use.
Q: Can I swim long distances in these pools?
Some pools are long continuous stretches (historical Ocean Dome long), though lots of indoor lagoons are for leisure, not lap swimming. To benefit from the long swims, make sure that you select a facility which has a lap pool or long pool lanes.