A tiny blot of a landmass off the western coast of Ireland is curiously labeled "Imaginary Isle of O Brazil" on cartographer Thomas Jefferys's 1768 "Chart of the Atlantic Ocean." A 21st-century ...

National Geographic said it hopes that separately identifying the Southern Ocean will highlight the region's unique conservation needs.

Scientists have mapped less than 25% of the world's seafloor. Experts say that getting that number up to 100% would improve everything from tsunami warnings to the Internet and renewable energy ...

A global map of the ocean floor could buoy the economy Researchers have mapped a quarter of it so far. Communications, shipping, mining and climate modeling could benefit.

The map, compiled using high-resolution data from the SWOT satellite, has revealed the existence of nearly 100,000 submerged mountains, called seamounts, scattered across the ocean floor.