border
国境 — Phenomena
The line between one country and another.
Portrait coin of Ptolemy ICirca 305–283 BC
Early Islamic dirhamThe early Islamic period
Morabitino gold coinSancho I (late 12th–early 13th century)
⚠ 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.