Largest Pool on Earth: Current Record Holder and Key Facts
The largest pool on Earth by water volume is the San Alfonso del Mar resort pool in Algarrobo, Chile. It holds roughly 250 million liters of seawater, covers about 8 hectares, and was completed in 2006. The project was developed by Crystal Lagoons, a Chilean company specializing in large-scale lagoon engineering, and the pool remains the Guinness World Record holder for the world's largest pool by area and volume. The facility uses a patented filtration and circulation system to maintain clear seawater without heavy chemical treatment, which is a core part of Crystal Lagoons' commercial model for resort and real estate projects worldwide. For background on the company and its global lagoon portfolio, see the overview at https://www.forbes.com/sites/forbesbusinesscouncil/2024/01/10/crystal-lagoons-the-innovators-behind-the-worlds-largest-pools/.
From a financial perspective, the San Alfonso del Mar pool is one of the most expensive aquatic facilities ever built, with estimated construction costs exceeding 2 billion USD at the time of completion. The project was developed by Fernando Fischmann, founder of Crystal Lagoons, and the resort is located on the grounds of the San Alfonso del Mar resort in Algarrobo, Chile, roughly 100 kilometers west of Santiago. The pool's scale is designed to support luxury tourism, real estate sales, and event hosting, and it has become a landmark that draws international visitors and media attention. For additional context on the resort and its economic impact, see the travel and business coverage at https://www.lonelyplanet.com/chile/algarrobo/san-alfonso-del-mar.
Engineering and Technology Behind the World's Largest Pool
Seawater Intake, Filtration, and Circulation System
The pool uses a patented system developed by Crystal Lagoons that pumps seawater from the Pacific Ocean, then filters and treats it to maintain clarity and safety. The system relies on a combination of mechanical filtration, UV treatment, and controlled circulation rather than conventional heavy chlorination, which reduces chemical use and environmental impact compared with traditional pool operations. The design allows the pool to maintain stable water quality across its massive surface area while minimizing energy consumption relative to the volume of water treated.
Scale, Depth, and Construction Logistics
The pool's maximum depth is around 35 meters, and its surface area is approximately 8 hectares, making it one of the largest engineered water bodies in the world. Construction required extensive earthworks, shoreline stabilization, and custom engineering to manage wave action and tidal conditions in the open ocean environment. The project was executed by a team led by Crystal Lagoons in collaboration with local Chilean contractors and engineering firms, with the design optimized for long-term durability and minimal maintenance footprint.
Comparison With Other Large Pools and Global Market Context
How the San Alfonso del Mar Pool Ranks Against Other Large Pools
The San Alfonso del Mar pool is the largest pool on Earth by both volume and area, surpassing other notable large pools such as the Orthlieb Pool in Casablanca, Morocco, and the Citystars Sharm El Sheikh lagoon in Egypt. While several resorts and urban developments have built large lagoons and pools in recent years, none have matched the San Alfonso del Mar pool's combination of volume, surface area, and seawater operation. The Guinness World Records listing for the world's largest pool has consistently recognized the San Alfonso del Mar facility, and the record remains current based on the latest publicly available data.
Crystal Lagoons' Business Model and Global Expansion
Crystal Lagoons operates a business model centered on licensing its lagoon technology to resort developers, real estate projects, and urban planners