Greens MP Jeremy Buckingham used a kitchen lighter to ignite bubbles of methane in the Condamine River in Queensland, about 220 kilometres west of Brisbane.
The video shows him jumping back in surprise, using an expletive as flames shoot up around the dinghy.
"Unbelievable. A river on fire. Don't let it burn the boat," Buckingham, from New South Wales, said in the footage posted on Facebook on Friday evening, which has been viewed more than two million times.
Australia is a major gas exporter, but the controversial fracking industry has faced a public backlash in some parts of the country over fears about the environmental impact.
Farmers and other landowners are concerned that fracking, an extraction method under which high-pressure water and chemicals are used to split rockbeds, could contaminate groundwater sources.
The Murray-Darling Basin is a river network sprawling for one million square kilometres (400,000 square miles) across five Australian states.
Origin Energy, which operates wells in the region, said it was monitoring the bubbling.
"We're aware of concerns regarding bubbling of the Condamine River, in particular, recent videos demonstrating that this naturally occurring gas is flammable when ignited," the company said in a statement to the Australian Broadcasting Corporation.
"We understand that this can be worrying, however, the seeps pose no risk to the environment, or to public safety, providing people show common sense and act responsibly around them."
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