A photo of the earth and its oceans taken from space. The photo has been changed so we can see all of the earth’s surface in one picture. The Pacific Ocean is the world’s largest ocean.

More than half the people on Earth live within 120 miles (193 kilometers) of the ocean, but even those who live nowhere near the sea are dependent on the massive saltwater ecosystem that covers ...

Andy Donaldson has completed the Oceans Seven challenge in record time. A Scottish swimmer has become the first person to swim the world's seven most dangerous channels in less than a year.