CANBERRA, July 16 (Xinhua) -- A British man has been described as "lucky" to be alive after jumping from a waterfall in an iconic Australian national park.

Josh Jones, 25, broke his left leg in two places and dislocated his knee in addition to sustaining several facial injuries, when he jumped 30 meters from a ledge at Jim Jim Falls in the Northern Territory's Kakadu National Park.

Jones, who was under the influence of alcohol at the time, was treated at the scene by a doctor and three medical students who were visiting the area.

"I saw the ledge and thought hey, that's possible to jump off," Jones told the Australian Broadcasting Corporation (ABC) on Monday.

"It was just pure impact (when I hit the water). I tried to pencil, it took the wind out of me, came up and the left leg didn't feel too good.

"I swam over to the edge, got a bit of air and...the left foot was out far to the left.

"(I want to thank) all the guys who came to help me, four doctors and everything ... strapped me up, pulled it (my leg) straight and we all got back to the camp."

Jones was taken to a nearby clinic before being airlifted to the Royal Darwin Hospital.

"About eight people carried him out...it's about 900 metres or so, but you've got to go over these huge big boulders and there's no path there whatsoever," Daniel Fitzgerald, a witness, said.

"He's lucky to survive...I thought he would hit the bottom of the cliff, and not the water," he said.