71% of the earth's surface is covered by water.
Oceans cover the largest percentage of the earth's water areas.
Body of Water & Percentage
Pacific Ocean 46%
Atlantic Ocean 24%
Indian Ocean 20%
Arctic Ocean 3%
Other Waters 7%
(Lakes, bays, seas, canals and other water masses are the remaining 7%)
However in terms of mass, the water only accounts for 0.023% of the Earth's 5.9736 x 1024 kg mass.