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
1.5m European citizens will miss out on the chance to vote on whether Britain stays in or quits the EU.
A quiet night ahead of us weather wise, with a mostly dry day tomorrow.
Ireland's overwhelming support for gay marriage is a message to the world, UN secretary general Ban Ki-moon said.