Jiande is rich in natural resources, known as the "land of beautiful mountains and rivers, cultural paradise, and tourist destination". The Jiande Xin'an River Tourism Festival has been held continuously since 1988 and has become the "Changjiang River Delta's most influential exhibition and festival brand". The Summer Winter Swimming International Challenge is an annual traditional mass sports event in Jiande that has been successfully held for 23 consecutive years. Relying on the Summer Winter Swimming Base, a rare winter swimming event base in China, Jiande actively creates its own unique event IP. The Jiande Marathon has been held for five consecutive years, tightly surrounded by the 17℃ Xin'an River, the well-deserved natural oxygen bar. We aim to create the most romantic, poetic, beautiful, and self-centered domestic river marathon brand event.