Tristan da Cunha, an island with 245 permanent residents, and which claims to be the “most remote inhabited island in the world,” is creating a critical marine protection zone to safeguard endangered rockhopper penguins, yellow-nosed albatross and other wildlife in an area of the South Atlantic three times the size of the United Kingdom.

The government of the British overseas territory, located in middle of the south Atlantic Ocean roughly between South Africa and Argentina, says that fishing and other “extractive activities” will be banned from 627,247 sq. km. of ocean around Tristan da Cunha and the archipelago’s three other major islands.

The sanctuary will be the biggest “no-take zone” in the Atlantic Ocean and the fourth biggest anywhere in the world, protecting fish that live in the waters and tens of millions of seabirds that feed on them, the territory said.

The isolated area supports 85 percent of the endangered northern rockhopper penguins, 11 species of whales and dolphins, and most of world’s sub-Antarctic fur seals, according to the Pew Bertarelli Ocean Legacy Project.

“Our life on Tristan da Cunha has always been based around our relationship with the sea, and that continues today,” says James Glass, the territory’s chief islander. “That’s why we’re fully protecting 90 percent of our waters, and we’re proud that we can play a key role in preserving the health of the oceans.”

The protection zone will become part of the UK’s Blue Belt Program, which is providing £27 ($46.46) million to promote marine conservation in the country’s overseas territories. The initiative has now protected 11.1 million sq. kn. of marine environment, or one percent of the world’s oceans.

The waters around Tristan da Cunha serve as a feeding ground for the critically endangered Tristan albatross and endangered yellow-nosed albatross.

The islands are also home to several species of land birds that live nowhere else, including the Wilkins bunting, the UK’s rarest bird, and the Inaccessible rail, the world’s smallest flightless bird, according to the Royal Society for the Protection of Birds.

The Pew Bertarelli project, which promotes the creation of marine reserves around the world, said it would help Tristan da Cunha protect its waters with technology that uses real-time data to evaluate ocean conditions and human activity such as fishing. The project is a joint venture of the Pew Charitable Trusts and the Bertarelli Foundation.

“This ambitious decision by the Tristan da Cunha Island Council to protect the archipelago’s waters is a great example of local leadership that has a global impact,” said Dona Bertarelli, co-chair of the Bertarelli Foundation.

The territory includes four main islands, the largest of which is Tristan da Cunha, located 2,810 km west of Cape Town, South Africa. It was discovered by the Dutch in 1643. Britain took possession in 1816, establishing the territory’s first permanent settlement. The island was evacuated after a volcanic eruption in 1961, but the islanders returned in 1963.

The territory’s most important source of income is commercial fishing for crayfish, known as the Tristan Rock Lobster, which is sold as a luxury product in the US, Europe, Japan and China.

“This small community is responsible for one of the biggest conservation achievements of 2020,” says Beccy Speight, chief executive of the Royal Society for the Protection of Birds. “This will protect one of the most pristine marine environments on the planet.”