Women wear colored mud on their faces during the Boryeong Mud Festival at Daecheon Beach in Boryeong, South Korea, Saturday, July 18, 2015. The 18th annual mud festival features mud wrestling and mud sliding.(Photo by Ahn Young-joon/AP Photo)

Tourists takes a mud shower during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. About 2 to 3 million domestic and international tourists visit the beach during the annual mud festival, according to the festival organisers. (Photo by Kim Hong-Ji/Reuters)

A tourist (C) covered with mud waits in a line to use toilet during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists play in a mud pool during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists play in a mud pool the Boryeong during Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists play in a mud pool during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists takes a mud shower during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists attend the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists attend the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

A tourists takes a selfie as he attends the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

A tourist poses for photographs during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

A hand print is seen on the back of a tourist during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Tourists play in a mud pool during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea, July 18, 2015. (Photo by Kim Hong-Ji/Reuters)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. The mud, which is believed to have benefical effects on the skin due to its mineral content, is sourced from mud flats near Boryeong and transported to the beach by truck. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers enjoy the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Festival-goers wrestle in the mud during the annual Boryeong Mud Festival at Daecheon Beach on July 18, 2015 in Boryeong, South Korea. (Photo by Chung Sung-Jun/Getty Images)