A "careless" campfire lit during a fire ban sparked a rapidly moving blaze that has now burnt hundreds of hectares on Moreton Island, about 40 kilometres north-east of Brisbane, according to authorities.

Around 20 campers were relocated on Saturday due to the threat of a large out-of-control bushfire in the island's north. Loading...

Fire crews worked tirelessly overnight to slow the spread of the fire, which is currently listed as a Watch and Act.

Rural Fire Service Queensland Acting Chief Superintendent Neil Parker said the cause of the blaze was a campfire lit at 10.30 am on Saturday at Eagers Creek, on the island's eastern coast.

A total fire ban has been in place since Thursday and will remain in effect until at least October 7.

Mr Parker said the fire had already burned 640 h

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