It's hard to imagine, but about 97 percent of the Earth's water can be found in our ocean. Of the tiny percentage that's not in the ocean, about two percent is frozen up in glaciers and ice caps. Less than one percent of all the water on Earth is fresh. A tiny fraction of water exists as water vapor in our atmosphere.
According to the U.S. Geological Survey, there are over 1,386,000,000 cubic kilometers (332,519,000 cubic miles) of water on the planet. A cubic mile is the volume of a cube measuring one mile on each side. Of this vast volume of water, NOAA's National Geophysical Data Center estimates that 1,335,000,000 cubic kilometers (321,003,271 cubic miles) is in the ocean.
That's enough water to fill about 352,670,000,000,000,000,000 gallon-sized milk containers!