I would like to plot different regions, some of them with different boundaries. For instance if I use

RegionPlot[{region1, region2}, BoundaryStyle -> {None,Directive[Black,Thick]}]

it does not work.

I was not able to find a workaround. Any idea?

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    – user9660
    Feb 9, 2016 at 9:56

1 Answer 1


I first thought this was a bug, but then I recalled the fact that grid dividers can be specified by part. This worked in this case too.

RegionPlot[{Disk[], Disk[{1, 0}]}, BoundaryStyle -> {
            1 -> Directive[Orange, Thick], 2 -> Directive[Black, Thick]}]

enter image description here

  • $\begingroup$ Fantastic, answers exactly my question! Thank you. $\endgroup$
    – fancy
    Feb 9, 2016 at 14:45
  • $\begingroup$ Awesome! Exactly what I was looking for. You made my day. $\endgroup$ Aug 3, 2022 at 17:54

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