Daecheon beach

Tourists play in the mud during the Boryeong Mud Festival at Daecheon beach in Boryeong...Tourists play in the mud during the Boryeong Mud Festival at Daecheon beach in Boryeong July 18, 2014. About 2 to 3 million domestic and international tourists visit the beach during the annual mud festival, according to the festival organisers.  REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: SOCIETY)

Kim Hong-Ji/Reuters

Tourists play in the mud during the Boryeong Mud Festival at Daecheon beach in Boryeong, South Korea. About 2m-3m domestic and international tourists visit the beach during the annual mud festival. 

People play in the mud during the Boryeong Mud Festival at Daecheon beach in Boryeong, about 190 km (118 miles) southwest of Seoul, July 19, 2013. About 2 to 3 million domestic and international tourists visit the beach during the annual mud festival, according to the festival organisers.

Lee Jae-Won/Reuters

People play in the mud during the Boryeong Mud Festival at Daecheon beach in Boryeong, about 190 km southwest of Seoul. About 2m-3m domestic and international tourists visit the beach during the annual festival.