A Tasmanian couple has tied the knot atop a waterfall near Cradle Mountain in Tasmania, before taking the ultimate plunge.

Thrillseekers Jarrod Wells and Cassy Austin from Dover won a competition run by an adventure tourism company to be married in the Dove Canyon.

After exchanging vows atop Freestyle Falls, the pair leapt seven metres as family and friends watched on.

The groom says there was some resistance from his bride.

"We wanted to do the leap together hand in hand, [which] required a bit of timing," he said.

"I didn't pause so Cassy sort of got dragged down a waterfall."

Mr Wells says the bridal party also needed some convincing.

"There were a few people who were like, ooh maybe," he said.

"It was just incredible."

The bride wore a white dress over her wetsuit.

The couple have tattoos on their fingers instead of rings - something that would not come off while canyoning.