The FINA World Open Water Swimming Championships, or more commonly "Open Water Worlds", was a bi-annual FINA (now World Aquatics) championship for open water swimming[1][2] held in even years from 2000 to 2010, inclusive. Race distances were 5, 10, and 25 kilometers (also known as 5K, 10K, and 25K).
The 10 km race at the 2008 edition served as the main qualifying event for the 2008 Olympics 10 km event.