UN headquarters in New York. File photo

"The ship has reached the shore," conference chair Rena Lee announced at the UN headquarters in New York shortly before 9:30pm (0230 GMT Sunday), to loud and lengthy applause from delegates.

The exact wording of the text was not immediately released but activists hailed it as a breakthrough moment for the protection of biodiversity after more than 15 years of discussions.

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The treaty is seen as essential to conserving 30 percent of the world's land and ocean by 2030, as agreed by world governments in a historic accord signed in Montreal in December.

"This is a historic day for conservation and a sign that in a divided world, protecting nature and people can triumph over geopolitics," said Greenpeace's Laura Meller.

Following two weeks of intense talks, including a marathon overnight session on Friday into Saturday, delegates finalized a text that now cannot be significantly altered.

"There will be no reopening or discussions of substance," Lee told negotiators.

The agreement will be formally adopted at a later date once it has been vetted by lawyers and translated into the United Nations' six official languages, she announced.

UN Secretary-General Antonio Guterres commended the delegates, according to a spokesperson who said the agreement was a "victory for multilateralism and for global efforts to counter the destructive trends facing ocean health, now and for generations to come."

Agence France-Presse