- World Ocean (Wikipedia)
In medieval Europe, the World Sea was the body of water that encircled the Continent (the mainland of Europe, Asia and Africa), and thus excluded the Mediterranean, Black and Caspian Seas.[citation needed] The contemporary concept of the World Ocean was coined in the early 20th century by the Russian oceanographer Yuly Shokalsky to refer to the continuous ocean that covers and encircles most of Earth. The global, interconnected body of salt water is sometimes referred to as the World Ocean, the global ocean or the great ocean. The concept of a continuous body of water with relatively unrestricted exchange between its components is critical in oceanography.
- Coast (Wikipedia)
A coast – also called the coastline, shoreline, or seashore – is the land next to the sea or the line that forms the boundary between the land and the ocean or a lake. Coasts are influenced by the topography of the surrounding landscape, as well as by water induced erosion, such as waves. The geological composition of rock and soil dictates the type of shore that is created. Earth contains roughly 620,000 km (390,000 mi) of coastline.