Updated June 07, 2018 13:10:21

Photo: Joohee Han, 25, was last seen at a supermarket at Tully, south of Cairns on May 31. (Supplied: Queensland Police Service)

A Korean tourist who was missing for a week has been found alive and well after a search in treacherous terrain in far north Queensland.

Authorities said Joohee Han, 25, was very dehydrated and a helicopter with a medic on board had picked her up about 12:15pm.

Inspector Steve Kersley said the woman was found by soldiers and police officers, who were searching an area after reports that screams for help were heard on Saturday.

He said the woman had no visible injuries apart from severe dehydration and had now been taken to hospital for further assessment.

"She's walking. She had a raincoat with her, so that obviously assisted her greatly in keeping her warm," Inspector Kersley said.

"Surviving is a miracle, I can tell you.

"Six days is a long time to be lost in the bush, particularly when you have no bush skills."

Inspector Steve Kersley said earlier today the bushwalk was known for being dangerous and difficult.

"There have been people lost on this mountain," he said.

"There's some big crevices on the back side of the hill, which are quite deep … it's very difficult country to find people in."

Photo: Around 20 volunteers and a rescue helicopter combed through bushland. (ABC News: Sharnie Kim )

Senior Constable Jane Moran said Ms Han's friends had raised the alarm yesterday, almost a week after she failed to return to her backpackers' accommodation.

"She sent a message to a friend saying she was going to do a walk up Mount Tyson at 11:00 on Friday morning and nobody has heard from her since then," she said.

"Her friends came into the police station yesterday and reported her missing and we commenced a search."

She said police officers, State Emergency Service (SES) crews and a rescue helicopter started searching the area yesterday.

SES area coordinator Eleanor Rosam said 20 volunteers had helped comb through bushland, behind the township of Tully.

"The terrain is very difficult, it is a track that is not used very frequently so it is not in the best condition," she said.

Photo: The track was not used frequently, SES area coordinator Eleanor Rosam said. (ABC News: Sharnie Kim )

Topics: emergency-incidents, disasters-and-accidents, missing-person, community-and-society, tully-4854, qld, australia, cairns-4870, brisbane-4000

First posted June 07, 2018 07:55:42