Map of Lower Austria showing districts with different colors for Waldviertel, Weinviertel, Mostviertel and Industrieviertel.
Viertelsgrenzen NÖ 1:50000 [1] by Land Niederösterreich;
File:Karte NOE Viertel Bezirke.svg by AleXXw, based on [2] (CC0);
Politische Bezirksgrenzen NÖ 1:1000 (Open Government Data) [3] by Land Niederösterreich
Land Niederösterreich, derivative work by AleXXw, Ailura