Amid hilly islands, 50 volcanoes, and blue-green waters north of New Zealand, that nation has committed to a 239,383-square-mile marine preserve. It has the world's second-deepest trench, and not all species are yet known.
The United Kingdom is planning to create the world's largest marine reserve in a remote part of the South Pacific, offering new, unprecedented protections to the more than 1,200 marine species that call this place home.
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