Global governments agreed on Friday to create the world’s largest marine sanctuary in an area described as the planet’s most pristine marine ecosystem—Antarctica’s Ross Sea.

“This is a victory for the whales, toothfish, and penguins that live in the Ross Sea, as well as for the millions of people who supported this effort,” said John Hocevar, a marine biologist with Greenpeace.

According to U.S. Secretary of State John Kerry, the decision offers “further proof that the world is finally beginning to understand the urgency of the threats facing our planet.” The U.S. and New Zealand had put forth the proposal.

The decision from the 25-member Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ) followed years of campaigning and “years of diplomatic wrangling and high-level talks between the U.S. and Russia, which has rejected the idea in the past,” the Associated Press reports. 

Roughly 1.55 million square kilometers (600,000 square miles)—more than twice the size of Texas—will be afforded protections for 35 years starting December 2017, with all fishing banned on 72 percent of the area.

The 35-year limit, the Guardian reports, was the result of “opposition from China and Russia which have fishing industries in the region.” Still, the move met widespread praise from conservation groups.

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