I divide nations and cultures, yet I am invisible to the eye, what am I that causes so many to sigh?

Category: Geography · Difficulty: expert

Hint: I am often marked on maps but cannot be seen physically.

Answer

A border

Explanation

Borders separate countries and regions, often leading to political and cultural differences, despite being intangible.

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

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