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What’s the largest ocean that ever existed on Earth?

Earth’s current largest ocean, the Pacific, blankets more than 30% of the planet’s surface, stretching 12,000 miles (19,000 kilometers) at its widest point, between Colombia and the Malay Peninsula, according to the Intergovernmental Oceanographic Commission of UNESCO (IOC UNESCO (opens in new tab)). But that titanic sea represents only the remnants of the largest ocean in Earth‘s history.

So what was the largest ocean ever to exist on our planet?

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