A swimmer crosses Nanhai Lake on July 20. The organizers said 230 swimmers in 17 teams from all across the country -- including Shanghai, Jiangxi province, Zhejiang province and Inner Mongolia autonomous region -- took part in the meet. The ages of participants ranged from five to 80. Nanhai Lake is one of four popular sites for swimming meets in Baotou city, along with Baiyin Lake, the Yellow River and Kunhe River. [Photo/Baotou Evening News]

Participants pose for a group photo on July 20. [Photo/Baotou Evening News]