What is the largest ocean basin on Earth?
At approximately 59 million square miles, the Pacific Ocean takes the cake for the largest ocean basin on Earth. Moreover, it also holds the title of the oldest ocean in the world, with some rocks dating back about 200 million years! The Atlantic Ocean took the runner-up spot, with the Indian, Southern and Arctic Oceans coming in third, fourth and fifth, respectively. As if the Pacific Ocean wasn’t enough of an imposing figure, the basin also has the nickname the “Ring of Fire” because of tectonic plate activity spurring earthquakes and volcanoes in these waters. Source: U.S. National Oceanic and Atmospheric Administration.