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border

国境　—　Phenomena

The line between one country and another.

Portrait coin of Ptolemy I Portrait coin of Ptolemy ICirca 305–283 BC Early Islamic dirham Early Islamic dirhamThe early Islamic period Morabitino gold coin Morabitino gold coinSancho I (late 12th–early 13th century)
A photograph of what this word names.

⚠ Currency does not stop at borders. Good money flows out across borders, while bad money flows in from neighboring countries. Attempts to stop the movement of currency at borders have repeatedly failed.