The federal government is under pressure to deliver on its promise to back a high seas biodiversity agreement, which has achieved a key milestone in its mission to create marine sanctuaries in international waters.

Australia was a founding signatory to the High Seas Treaty in 2023, with the federal government promising to ratify its commitment "as quickly as possible".

The treaty required approval by 60 nations for it to become law and that target was met on Friday, when Morocco became the 60th, meaning the law will take effect in January.

Greenpeace Australia Pacific campaigner Elle Lawless said it was disappointing Australia wasn't yet among the signatories, despite being one of the first countries to sign the treaty at the UN General Assembly in 2023.

"Today is a global win but a do

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