The Ocean strongly contributes to our well-being but is severely impacted by human activities. Here, I propose seven domains of action to structure our collective efforts toward a scientifically sound, just, and holistic governance of a sustainable Ocean. Main text: The Ocean We live on one Planet, which hosts one Ocean. The Ocean is unique; it covers 71% of our Planet for more than 95% of its living space, and is distributed in interconnected basins modulated by a range of physical oceanographic processes.