That is the Prime Meridian, and it runs through Greenwich England.
greenwich
Greenwhich
The place name associated with the 0 degree meridian is Greenwich, London, United Kingdom. This is where the Prime Meridian is located and is considered the starting point for measuring longitude. The Royal Observatory in Greenwich marks the spot where the Prime Meridian passes through.
The Prime Meridian, or the Greenwich Meridian.
the prime meridian
Greenwich, England
That would be the Prime Meridian.
Another name is Prime Meridian.
Greenwich Meridian or the International Meridian
The Prime or Greenwich meridian. 0 degrees longitude
Prime Meridian
The international date line