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# WORK_TITLE: 居庸關
# DISPLAY_TITLE: 居庸關
# AUTHOR:
# TIMES:
# PAGE_TITLE: 居庸關
# CATEGORIES:
居庸關，中原名關也，同八達嶺長城為北京西北之邊陲屏障也。距北京一百二十華里
。
同倒馬關和
紫荊關，合稱「內三關」。
史
始於春秋戰國，
呂氏春秋曾言：「天下九塞，居庸其一。」至北魏，居庸關始與長城相連。
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