The 0-meridian, running from North to South through Greenwich, UK (near London city).
The Earth is divided into four hemispheres - Northern Hemisphere, Southern Hemisphere, Eastern Hemisphere, and Western Hemisphere - based on lines of latitude and longitude. The equator divides the Northern and Southern Hemispheres, while the Prime Meridian and the International Date Line divide the Eastern and Western Hemispheres.
AfricaAntarcticaAsiaAustralia
The Prime Meridian divides the globe into Eastern and Western hemispheres, just as the equator divides the globe into Northern and Southern hemispheres.
The line that divides the Eastern and Western hemispheres is called the Prime Meridian.
That would have to be the Atlantic and Pacific oceans.
The Mississippi River.
Western part of the United States
The Equator divides the Eastern and Western Hemispheres.
Equator
France
The prime meridian
The Mississippi River.