This picture shows the size of a sphere that would contain all of Earth's water in comparison to the size of the Earth. The diameter would be roughly the distance from Salt Lake City, Utah to Topeka, Kansas.
The sphere includes all the water in the oceans, seas, ice caps, lakes and rivers as well as groundwater, atmospheric water, and even the water in you, your dog, and your tomato plant.
Source: ga.water.usgs.gov
