The subregion of Southern Europe extends the farthest in Western Europe, more specifically, the country of Greece.
Somalia is the farthest country east.
Yemen is the farthest-south country in the Middle East.
The farthest north country is Denmark (via Greenland). The farthest east country is Kiribati.
About 20 degrees east latitude to 40 degrees east latitude.
Russia lies farthest to the east
Brazil is the South American country that extends the farthest east.
Norway.
Helsinki, Finland.
Denmark is the farthest east North American nation via Greenland. However, just including points on the continent, then Canada is farthest east.
Russia lies farthest to the east
The nation that is furthest west on the continent of Europe is Portugal. However, Iceland is further west but is an island. It has been traditionally part of Europe.