Best way to draw lines on terrain for nation borders

Hi guys,

I want to make a game with nations and I need a way to draw their borders on the terrain. Im not really sure how to go about doing this, but I need the borders to be able to change when the countries go to war and stuff like that… Im trying to get it to look like Civilization 5 nation borders, but without the hex terrain. 2313598--155932--civ-5-game-play.jpg

Im just using Unitys terrain, so any help would be appreciated! Thanks

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