A huge area of ocean around two remote Australian territories will be protected as part of the federal budget, leaving conservationists grinning.
The Morrison government's 2021/22 budget locks in a $100 million package for protecting the oceans.
It includes nearly $40 million for new marine park partnerships.
The new marine parks will be off Christmas Island and the Cocos Keeling Islands and will cover up to 740,000 square kilometres of the Indian Ocean.
That's twice the size of the Great Barrier Reef Marine Park.
Australian Marine Conservation Society chief Darren Kindleysides said the islands were recognised as natural wonders.
"Oceans across the globe are in deep trouble from pollution, overfishing, habitat loss and the very real and immediate impacts of climate change," he said.
"Establishing marine parks to provide a safe haven for our marine life is critical in helping stop our oceans reaching a tipping point."
The new parks increase the percentage of protected Australian waters from 37 per cent to 45 per cent.
The protected areas are in the Indian Ocean where endangered southern bluefin tuna and other marine species breed.
The government's goal is for a balance between natural habitat conservation, sustainable water use, eco-tourism promotion, research and regional economy stimulation.
Pew Charitable Trusts director Michelle Grady said the islands were globally significant, pointing to world-renowned naturalist David Attenborough naming Christmas Island as one of the 10 natural wonders of the world.
Christmas Island is famous for its annual red crab migration when tens of millions of crustaceans leave their forest homes and migrate to the shore to mate and spawn.
"Its thriving rainforests, deserted beaches and fringing reef provide a haven for unique and rare seabirds, land crabs and marine life," Ms Grady said.
"The Cocos Keeling Islands are Australia's unspoiled tropical island paradise. Their azure waters are home to an incredible array of diverse marine life including tropical fish, corals, turtles, manta rays and dolphins."
The government predicts Australia's ocean industries to contribute $100 billion to the economy each year by 2025, supporting close to 400,000 jobs.
Australian Associated Press