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People ride "Sampan Leper", a kind of boat sliding on the mud, in Indragiri Hilir, Riau, Indonesia, March 31, 2018. (Xinhua/Dedi Sutisna)
People ride "Sampan Leper", a kind of boat sliding on the mud, in Indragiri Hilir, Riau, Indonesia, March 31, 2018. (Xinhua/Dedi Sutisna)