鞍部(saddle)为山脊上两山间的低浅处,形似马鞍,故称之[1]。来往被山相隔的地方,最短的路径一般都是经过鞍部,因而形成山的重要通道,故又称之为山口(mountain pass)或垭口。有些鞍部附近坡度较为平缓,常称之为岭。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/KhyberPassPakistan.jpg/640px-KhyberPassPakistan.jpg)
在军事上,鞍部是一个容易防守的地方,只须少量兵力便可守住,使敌军不能跨越,因而常在此设置关卡或其他军事设施,此时会称之为隘口。
参见
参考文献
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