Ocean Coral Reef Saline water covers approximately 360,000,000 km2 (140,000,000 sq mi) and is customarily divided into several principal oceans and smaller seas, with the ocean covering approximately 71% of Earth's surface and 90% of the Earth's biosphere. Journal · 08 · 19+♥ 94 Last update at 19 · 08 · by milo ‧‧‧ One of 3421Ocean More in OceanMore in Photography Home Ocean > PhotographyCoral Reef PIFTW