United Nations heritage body Unesco has voted not to put Australia's Great Barrier Reef on its world danger list.
The decision has been welcomed by the state of Queensland, which generates billions of dollars in tourism revenue from the reef.
Despite deciding against giving the reef protected status, Unesco did warn that it faced "major threats".
The reef, which stretches 2,000km (1,200 miles) along the coast, is the world's largest living ecosystem.
Jackie Trad, Queensland's deputy state premier, told the BBC she was "absolutely pleased about the decision".
"It was an incredible moment in history, in Queensland and Australian history," said Ms Trad.
She acknowledged there had been a decline in the health of the reef, but said that the Queensland government had made "strong commitments" to protecting it.
Australia will have to report back to Unesco at the end of 2016 and again in 2020 to show its implementation of the body's recommendations