Rheinsberg, not only familiar to writers, in the district of Ostprignitz-Ruppin, once again served as an idyllic backdrop for Germany's largest SwimRun. On June 22, 2025, nearly 600 endurance athletes streamed into the town on Lake Grienericksee, also to participate in the SwimRun World Championships held as part of this year's SwimRun Rheinsberg.