Vast bodies of water refer to the OCEANS and seas, which are large bodies of saline water that cover approximately 70% of the Earth's surface. OCEANS are the largest of these bodies of water, covering an area of 361 million square kilometers, while seas are smaller, covering an area of about 3.5 million square kilometers. OCEANS and seas are home to a wide variety of marine life, and they also provide important resources for humans, such as food, transportation, and recreation.