Since National Geographic began making maps in 1915, it has recognized four ... to the north Extending from the surface to the ocean floor, the ACC transports more water than any other ocean ...

This story appears in the September 2012 issue of National Geographic ... More finely detailed maps of the surface of Mars may exist than of the remotest parts of the ocean floor.

This story appears in the April 2017 issue of National Geographic magazine. The map above is essentially an x-ray of the ocean, and the colors show where it’s feeling the most impact from human ...