Drainage, structural and ocean are the major types of basins. As for ocean basins, the Pacific Ocean is the world's largest, covering 63 million square miles, with deep depths averaging 13,000 feet.

Scientists discover the largest-ever mega coral off the coasts of the Solomon Island in the southwest Pacific Ocean. NATIONAL GEOGRAPHIC PRISTINE SEAS/AFP via Getty Images ...

Far beneath the ocean's surface, where mountain belts rise and ancient oceanic crust lies hidden, a long-lost tectonic plate ...

The Pacific Ocean is the largest body of water on Earth, but just how big is it really? Covering over 63 million square miles (165 million square kilometers), it’s larger than all the continents ...