Australia is set to protect more ocean than any other nation on Earth after the federal government announced a major expansion of a sub-Antarctic marine reserve. The Heard Island and McDonald Islands Marine Reserve — located roughly 4,000 kilometers southwest of Perth — will quadruple in size, adding more than 300,000 square kilometers of protected waters. The move pushes Australia’s total ocean protection to 52% of its marine territory, far exceeding the global 30-by-2030 target the country committed to just two years ago.
At a glance
- Marine reserve expansion: The Heard Island and McDonald Islands Marine Reserve will grow by more than 300,000 square kilometers — an area roughly equivalent in size to Italy — adding habitat protection zones and national park areas to existing sanctuary zones.
- Ocean protection milestone: At 52% of its marine territory under protection, Australia now leads all nations in the share of its oceans covered by formal conservation designations, surpassing the international 30×30 goal by a wide margin.
- Sub-Antarctic biodiversity: Heard and McDonald Islands host glaciers, wetlands, Australia’s only active volcanoes, and wildlife including albatross, macaroni penguins, elephant seals, and fish species found almost nowhere else on Earth.
Why these islands matter
Heard and McDonald Islands sit about 1,700 kilometers from Antarctica and are among the least human-disturbed places on the planet. Scientists describe them as wildlife havens — dense with species that depend on clean, cold southern ocean waters to feed and breed.
The Pew Charitable Trusts’ national oceans manager, Fiona Maxwell, said the bulk of waters around the islands would now be free from mining and the creation of new pelagic fisheries targeting species like mackerel icefish and Patagonian toothfish. That is a meaningful protection for an ecosystem that has largely escaped the pressures that have degraded so many other marine environments.
The announcement follows Australia tripling the size of the Macquarie Island Marine Park — another sub-Antarctic reserve — the previous year. Taken together, these moves signal a sustained shift in how Australia is managing its vast southern ocean territories.
The gaps scientists are watching
The expansion was welcomed by a broad coalition of conservation groups, but scientists and advocates were clear that it fell short of the highest possible standard. An alliance of 27 environment organizations under the Save Our Marine Life banner noted that some areas crucial to albatross, penguins, seals, and fish did not receive sanctuary-level protection — the strongest designation available.
Maxwell pointed out that important undersea canyons and seamounts were excluded from sanctuary zones. “Even the government’s own science report said there was inadequate protection for a range of seafloor habitats, foraging areas for albatross and macaroni penguins, and areas supporting an abundance and variety of fish,” she said.
WWF Australia‘s head of oceans, Richard Leck, called the expansion significant but said allowing fishing to continue in some high conservation value areas was a missed opportunity to deliver world-class protection for the islands.
Funding remains the missing piece
Conservation leaders at a global nature positive summit held in Sydney used the moment to press a harder question: is Australia spending enough to back its ambitions?
The 30 by 30 Alliance — a group of conservation, land management, and scientific experts — argued that financing for nature protection must increase dramatically if Australia is to meet its targets in a meaningful way. Jason Lyddieth of the alliance said the Albanese government allocated just 0.1% of its spending to nature, and that figure should be closer to 1%. He called for a $5 billion fund to buy and protect land of high biodiversity importance.
The Biodiversity Council found that the Australian government spent roughly 50 times more subsidizing activities that damage nature — including mining, agricultural clearing, and native forest logging — than it did on biodiversity protection. That gap between declared ambition and actual investment is the central challenge now facing Australian conservation policy.
A record worth building on
Still, the scale of what Australia has now committed to protecting is genuinely striking. Fifty-two percent of a nation’s ocean territory under formal protection, in a world where most countries are still working toward 30%, is a real marker. The International Union for Conservation of Nature and other bodies have long argued that large, well-enforced marine protected areas are among the most effective tools available for reversing ocean biodiversity loss.
The announcement was made ahead of a global summit in Sydney and reflects Australia’s growing role in shaping international ocean conservation norms. Whether the country follows through with the funding and enforcement muscle to match that leadership is the story that comes next.
The Heard and McDonald Islands expansion is open to scrutiny, and scientists have already identified where it could go further. But 300,000 square kilometers of new protection for one of the most extraordinary and least-touched marine environments on Earth is a foundation worth recognizing — and building on.
Read more
For more on this story, see: The Guardian
For more from Good News for Humankind, see:
- Ghana establishes a new marine protected area at Cape Three Points
- Renewables now make up at least 49% of global power capacity
- The Good News for Humankind archive on Australia
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