The United States has announced the creation of the world's largest marine sanctuary in the Pacific, where commercial fishing and energy exploration are off limits.
The move expands the already existing Pacific Remote Islands Marine National Monument - west of Hawaii and northeast of Australia - to six times its previous size.
"We're talking about an area of ocean that's nearly twice the size of Texas, and that will be protected in perpetuity from commercial fishing and other resource-extraction activities, like deep-water mining," Secretary of State John Kerry said on Thursday.
Former president George W Bush declared the area a national monument in 2009, and an executive order from President Barack Obama makes the protected space even larger.
The total protected area now includes 1.27 million square kilometres around the Wake and Jarvis Islands and Johnston Atoll.
"This is the grand-daddy of all marine protected areas around the world," said Jackie Savitz, vice president for US oceans at the advocacy group Oceana.
A key goal is to protect the undersea mountains that provide habitat and hunting grounds for tuna, sea turtles, manta rays, and sharks, and to allow them to breed and multiply.
Coral reefs that are in peril from bleaching and ocean acidification are plentiful in the area, and protecting them allows scientists to use them as a benchmark for global research on climate change.
The marine protected area is considered federal land, where commercial fishing is prohibited, although some recreational fishing will continue to be allowed, with special permits.
Biologists at the US Fish and Wildlife Service say the establishment of the protected area has already helped boost some creatures that had all but disappeared at Johnson Atoll.
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