The wide variety of activities associated with Český Krumlov also features major sports competitions, one of which certainly is the river marathon with the largest number of contestants in the Czech Republic.
The first annual Český Krumlov International River Marathon took place in 2003. The organizers were inspired by the river marathan which takes place in the French canyon of Ardéche and "trasferred" this event to Southern Bohemia and the Vltava River.