Too hot this summer? Try a "cold water swim" in Jiande, Hangzhou! On July 27, fearless competitors plunged into the 17 degrees Celsius Xin'an River, battling a current flowing at 1.5 meters per second over 900 meters. Fed by a deep reservoir below the dam, the river stays a brisk 14 to 17 degrees Celsius year-round – making this a rare "winter swim" in midsummer. Since 1988, the thrilling race has become a must-see event in the Yangtze River Delta. Dive in – if you dare!