Distribution map of the Low German (Low Franconian and Low Saxon) languages since 1945. Note however that it's bad:
"Low Saxon Dialects:   ...   4 = East Frisian   5 Low Saxon dialects in the Netherlands" – Parts of what's labelled East Frisian are in the North-East of the Netherlands
"15 = Meuse-Rhenish" – that's Kleverlandish and East Bergish, Meuse-Rhenish covers more (cp. File:Rheinmaaslaendisch.svg)
Verbreitungsgebiet_der_heutigen_niederdeutschen_Mundarten.PNG
Europe.svg
Verbreitungsgebiet_der_heutigen_niederdeutschen_Mundarten.PNG: Postmann Michael
Europe.svg: CIA World Factbook; uploaded by Sanao
derivative work: Alphathon /'æl.f'æ.ðɒn/ (talk)