The 2025 United Nations Ocean Conference (officially the 2025 United Nations Conference to Support the Implementation of Sustainable Development Goal 14; abbreviated UNOC3) was a United Nations conference held in Nice, France, from 9–13 June 2025 which sought to mobilize action for the conservation and sustainable use of the oceans, seas and marine resources. The conference was the third of its kind, following the 2017 conference in New York City and a second in Lisbon. It was jointly organized by France and Costa Rica.
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