Sam Woodhead will be taken to Longreach Base Hospital for a medical assessment, Queensland Police said.
The teenager's sister wrote on Facebook: "We have been told that they have found Sam!! We have no information on his condition or where he was found yet, so keep your fingers crossed."
More top news
Astronaut who became an internet sensation after posting a video of himself performing a David Bowie classic in space releases album.
Ancient African DNA sequenced for the first time has revealed a huge wave of migration from Eurasia 3,000 years ago.
Pauline Cafferkey, who contracted Ebola whilst working in West Africa last year, has been flown to the Royal Free Hospital in London.