Is there a way to only color the borders where the polygons are adjacent?

For example, I want to color the borders in the green circle, but not the ones in the red cirlce.

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  • 2
    Extract common borders as lines as per this question: gis.stackexchange.com/questions/359279/… - then disable drawing of the borders of the polygons, then display the line-layer on top of the polygons. – Erik Aug 13 '20 at 19:53
  • 1
    Another possibility is to create a polygon with the sea. Then you will need to define a white border – Christophe P. Aug 14 '20 at 7:32

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