I separate countries and can ignite conflicts. Though I am often invisible, my effects are tangible. What am I?

Category: Knowledge · Difficulty: expert

Hint: Consider what delineates territories on a map.

Answer

A border

Explanation

Borders define the limits of nations and can lead to disputes or wars, even if not physically present.

This is a expert knowledge riddle — one of the harder riddles here. The answer is A border.

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