In Greenwich district (from which the name, Greenwich Meridian), as per Royal Observatory settled there, just eastwards from London, England.
The Alps are a divide between Northern and Southern Europe.
In reality there is no sudden physical divide, it is more of a gradual transition.
An imaginary line known as the Iron Curtain is what you are referring to. This separated the communist countries of eastern Europe, from the countries in Western Europe.
Iron curtain
iron curtain
eurasia
There is also a view as EurAsia is one continent and there is no dividing line between the two. In contrast if we look, the Ural Mountains in Russia could be a dividing line between Europe and Asia.
terminator
The Ural & Caucus Mountains as well as the Bosphorus Strait.
ural mountains
Asia. The dividing line between Europe and Asia is generally thought to be the Ural mountains.
Moscow is in the part of Russia that is in Europe.
The Border line dividing Pakistan and Afganistaan
The Ural Mountains are the dividing line between Europe and Asia. They're located in Russia.
The name is Ural. Although not everyone agrees with this particular demarcation of the Europe/Asia dividing line.
Russia is partly in Europe and partly in Asia. The Ural Mountains (in Russia) are the dividing line between the two continents.