An Australian woman miraculously survived plunging 111 metres off Victoria Falls bridge in Zambia after her bungee cord snapped.

Erin Langworthy, 22, was unharmed except for cuts and bruises after the New Year's Eve fall, which saw her land in rapids in the Zambezi River.

"It's a miracle I survived," she told the Sydney Morning Herald.

Langworthy had to fight to free the bungee cord, still wrapped around her legs, from rocks so she could swim clear of the rapids.

She was given medical treatment before being evacuated to South Africa.

"The bungee has proven to be a very viable operation considering that more than 50,000 tourists jump on it every year. It has been in operation for 10 years," a Zambian minister told Lusakatimes.com

Bungee jumpers are attached to a cord latex strands wrapped together within a braided cover. The cord can usually hold a weight of over 1,500lbs.

South Africa