Precise Color Filling with borders in a map

Question

I would like to have a "SimplifiedArea" borders and color filling for each country exactly following the border line, but I get this rough profile

 GeoRegionValuePlot[{GeoVariant[Entity["Country", "Spain"], "SimplifiedArea"] -> 11., 
    GeoVariant[Entity["Country", "Italy"], "SimplifiedArea"] -> 9,
    GeoVariant[Entity["Country", "Austria"], "SimplifiedArea"] -> 5}, 
    ColorFunction -> (Directive[Opacity[#], Red] &), ImageSize -> 1000,
    GeoRange -> {{34, 60}, {-17, 30}}, 
    GeoBackground -> {"CountryBorders", "Land" -> White, "Ocean" -> None, "Border" -> Lighter@Gray}, GeoProjection -> "Robinson"]

Is there any way to draw the same borders are coloured? Best

Answer 1

PlotStyle -> Directive[EdgeForm[{Thick, Opacity[0.5], Gray}]]

Answer 2

You can use GeoBackground -> None and use "SimplifiedArea" polygons for all countries:

europe = EntityList @ EntityClass["Country", "EuropeExtended"];

assoc1 = Association[GeoVariant[#, "SimplifiedArea"] -> 0. & /@ europe];

assoc2 = {GeoVariant[Entity["Country", "Spain"], "SimplifiedArea"] -> 11., 
      GeoVariant[Entity["Country", "Italy"], "SimplifiedArea"] -> 9, 
      GeoVariant[Entity["Country", "Austria"], "SimplifiedArea"] -> 5};

assoc = AssociateTo[ assoc1, assoc2];

GeoRegionValuePlot[assoc, 
 ColorFunction -> (Directive[Opacity[#], Red] &), ImageSize -> 1000, 
 GeoRange -> {{34, 60}, {-17, 30}}, 
 GeoBackground -> None, GeoProjection -> "Robinson"]