World's Largest Swimming Pool Location and Size

By Sarah Miller · May 1, 2027

The largest swimming pool in the world is the San Alfonso del Mar Seawater Pool, located in Algarrobo, Chile. Spanning approximately 1,013 meters (3,323 feet) in length and covering 8 hectares (19.7 acres), this massive infinity pool holds about 250 million liters (66 million gallons) of seawater and reaches depths of up to 3.5 meters (11.5 feet).

Overview of the World's Largest Swimming Pool

Built by the Crystal Lagoons Corporation, the San Alfonso del Mar pool redefined recreational water features when it opened in 2006. Unlike traditional pools, this lagoon-style body of water uses advanced filtration technology to maintain crystal-clear seawater without chlorination, drawing directly from the Pacific Ocean.

Key Features

Length: 1,013 meters (longest in the world)
Surface area: 8 hectares (19.7 acres)
Maximum depth: 3.5 meters (11.5 feet)
Water volume: ~250 million liters (66 million gallons)
Water source: Natural seawater, filtered and circulated
Temperature: Maintained year-round at 24–26°C (75–79°F)

Comparison with Other Large Pools

While several large pools exist globally, none surpass San Alfonso del Mar in size. The following table compares notable record-holding pools based on verified dimensions and capacity.

Pool Name	Location	Length (m)	Area (hectares)	Volume (liters)	Year Opened
San Alfonso del Mar	Algarrobo, Chile	1,013	8.0	250,000,000	2006
Deep Dive Dubai	Dubai, UAE	Not applicable	0.1	14,000,000	2021
Orka Istanbul	Istanbul, Turkey	700	5.5	100,000,000	2022
Grand Lisboa Palace Resort	Macau, China	500	4.0	80,000,000	2023

Table data source:1, 2, 3, 4, 5

The data clearly shows that San Alfonso del Mar exceeds the next largest recreational pool by over 300 meters in length and more than double in surface area. While newer developments like Orka Istanbul and Deep Dive Dubai offer unique experiences, they do not match the sheer scale of the Chilean lagoon.

Technology Behind the Record-Breaking Pool

The pool’s engineering relies on Crystal Lagoons’ proprietary technology, which continuously filters and disinfects seawater using minimal chemicals. This system maintains clarity and safety while reducing environmental impact compared to conventional chlorinated pools.

How It Works

Seawater is drawn from the ocean via intake pipes
Filtration removes debris and microorganisms
UV and electrolysis systems control pathogens naturally
Water circulates constantly to prevent stagnation
Automated monitoring ensures consistent quality

Public Access and Usage

The pool is part of a private residential resort complex. Access is primarily reserved for residents and hotel guests, though limited day passes may be available during peak seasons. It supports various water activities including swimming, kayaking, paddleboarding, and even sailing small boats.

Common Questions About the World's Largest Swimming Pool

Is the world's largest swimming pool open to the public?

Access to the San Alfonso del Mar pool is restricted to guests of the resort and property owners. While not fully public, some seasonal day-use options may be offered through affiliated hotels or special arrangements.

How does the largest pool stay clean without chlorine?

The pool uses a patented filtration and disinfection system developed by Crystal Lagoons. It combines fine filtration, UV treatment, and electrolysis of seawater to produce natural hypochlorous acid, effectively sanitizing the water without adding synthetic chlorine.

Can you swim the entire length of the world's biggest pool?

Yes, the full 1,013-meter length is swimmable. However, due to its use as a multi-activity lagoon, long-distance swimmers are encouraged to coordinate with staff to avoid high-traffic zones and ensure safety.

What is the temperature of the water in the largest pool?

The water is maintained between 24°C and 26°C (75–79°F) year-round, thanks to natural solar heating and circulation management. This makes it comfortable for swimming in both summer and winter months.

Has any other pool challenged the record since 2006?

Several large pools have been built, such as Orka Istanbul (700m) and developments in Macau and Dubai. However, none have surpassed San Alfonso del Mar in total length or volume. As of 2025, it remains the undisputed record holder per Guinness World Records.