 The abundance of water on Earth 's surface is a unique feature that distinguishes the " Blue Planet " from other planets in the Solar System . Earth 's hydrosphere consists chiefly of the oceans , but technically includes all water surfaces in the world , including inland seas , lakes , rivers , and underground waters down to a depth of 2 @,@ 000 m . The deepest underwater location is Challenger Deep of the Mariana Trench in the Pacific Ocean with a depth of 10 @,@ 911 @.@ 4 m . 
