In these photos provided by Boryeong City, some 4,300 participants start to run during the 20th Boryeong Mud Marathon held in Boryeong, South Chungcheong Province, on June 11, 2023. Participants can choose from three courses: 21 kilometers, 10 km and 5 km. (PHOTO NOT FOR SALE) (Yonhap)
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