FINA Marathon Swim World Series

The FINA Marathon Swim World Series, known as the 10 km Marathon Swimming World Cup until 2017, is a series of 10-kilometer, open water swimming races held annually since 2007. Prior to 2007, 10K races were held as part of the FINA's Open Water Grand Prix series; post split, this latter series is now for races over 10 kilometers in length.