You will have to do a little bit of research, here is a hint:
in the entry entitled North European Plain
"major reference (in European Plain (plain, Europe): Physiography)
...all of western and northern France, Belgium, The Netherlands, southern Scandinavia, northern Germany, and nearly all of Poland; from northern France and Belgium eastward it commonly is called the North European Plain. In the east the plain generally is called the East European, or Russian, Plain."
-brittanica
Which countries does the North European Plain run through?
Belarus
Bulgaria
Croatia
Macedonia
Poland
Russia
3 answers
Nope. Check out this article.
http://en.wikipedia.org/wiki/North_European_Plain
http://en.wikipedia.org/wiki/North_European_Plain
Bryce -- what is the source of your quotation?