Winter swimming enthusiasts take a dip in the icy waters of the Vistula River in Warsaw, Poland, on Nov. 23, 2025. Sunday marked the opening of the cold-water swimming season in Warsaw. (Photo by Jaap Arriens/Xinhua)
Winter swimming enthusiasts take a dip in the icy waters of the Vistula River in Warsaw, Poland, on Nov. 23, 2025. Sunday marked the opening of the cold-water swimming season in Warsaw. (Photo by Jaap Arriens/Xinhua)
Winter swimmers warm up by a bonfire on the snowy banks of the Vistula River in Warsaw, Poland, on Nov. 23, 2025. Sunday marked the opening of the cold-water swimming season in Warsaw. (Photo by Jaap Arriens/Xinhua)