Participants wrestle in mud pool during Boryeong Mud Festival held in S. Korea

Participants wrestle in a mud pool during the Boryeong Mud Festival at Daecheon Beach in Boryeong , South Korea, Saturday, July 20, 2013.

The 16th annual mud festival features mud wrestling and mud sliding. <AP Photo/NEWSis/Ahn Young-joon>

Foreign tourists make up with color mud during the Boryeong Mud Festival at Daecheon Beach in Boryeong , South Korea, Saturday, July 20, 2013. <AP Photo/NEWSis/Ahn Young-joon>

Participants play in a mud pool during the Boryeong Mud Festival at Daecheon Beach in Boryeong , South Korea, Saturday, July 20, 2013.  <AP Photo/NEWSis/Ahn Young-joon>