The dramatic scenes were filmed at Blankenberge beach on Saturday as sunseekers clashed with cops and lifeguards.
Footage shows a chair being hurled across the sand as sunbathers wildly launch themselves at one another.
One man is filmed using an umbrella as a weapon, throwing it at a police officer as lifeguards watch on.
Others fight among themselves, with grown men flying across the golden sand.
The fight is said to have started when a lifeguard told a group of around 40 youngsters that sitting on the breakwater was prohibited.
The group reportedly refused to leave, resulting in the massive brawl.
Describing the incident, a bar manager told De Standaard: “There was suddenly massive fighting and total chaos broke out.
“Sun umbrellas and sunbeds flew, windsurfing poles were used as weapons.”
Sand and other objects were thrown at officers, as they shielded themselves with batons and face masks.
Cops arrested a number of people involved, with the town’s mayor condemning their behaviour.
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Mayor Daphné Dumery said: “I think this is terrible.
“For people who come with good intention and want to enjoy a day in Blankenberge, this is very bad. I think of children and their parents.”
Mayor Dumery asked for all trains to Blackenberge to be cancelled on Sunday, banning day-trippers from the seaside resort.
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