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Claire Nelson has been flown to a local hospital for treatment after rescuers found her on Friday about 4pm (local time) in a national park in California.
Joshua Tree National Park Superintendent David Smith said a River County Sheriff's helicopter crew discovered Nelson in a "wash" - a dried-out river bed - in the park.
The crew were able to make contact with the 36-year-old and rescued her from the wash before flying her to safety.
The search began about six hours earlier when Nelson's vehicle was found in the parking area for the Lost Palms Oasis and Mastodon Peak trailhead.
Searchers from the park and Riverside County Sheriff's Department began the search and a rescue helicopter crew was also called in.
Nelson - whose Facebook pages lists her as a freelance writer, editor and "perpetual traveller" - is believed to have become lost in the park and was last heard from on Tuesday.
She had told a friend earlier in the week she was planning to hike to Lost Palms Oasis and would be back on Wednesday, but had not made contact with anyone since then.
KESQ news reported she was found with a shattered pelvis.
Smith said he knew Nelson had some injuries, but was unsure of the extent or how she came to be injured.