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Before you pass

You asked for /political. The whole atlas sits behind this one door.

I am a shape that fits inside itself forever.

I am drawn at three sizes and none of them is the real one.

I am the reason you can hold a country in your hand.

Which am I?

If you were not given an answer, you do not have one — this site is not a puzzle you can solve, and the riddle above is not the lock. Ask whoever sent you here.