The 14th annual festival took place in Boryeong and, in particular, was praised for the 'mud mob scene' where mud was sprayed onto Daecheon beach and millions of revelers partied and danced in the sloppy conditions.
The mud, which is hailed for it's high mineral content, was shipped onto the beach by truck.
Other activities on offer were naturally mud related - including mud sliding, mud wrestling, and swimming in a giant 'mud tub'.
English teacher Nick Prado, who attended the mud festival, said: 'The best thing about the festival is just acting like a little kid, getting covered in mud and not really caring and just going wild.
'It's good.'
About 50,000 tourists also attended the festival, which is said to have generated $52m (£32m) for the region's economy.
Koo Moon-hoe, a Tourism Department Chief for the region said: 'Foreigners seem to enjoy this festival because they can take part in many different activities, feel the mud and mingle with people from around the globe.'
/Metro.co.uk/