Bird-thin paths wind through the mountains, steep and hard to walk.
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history
Made famous by Li Bai's 《蜀道难》: '西当太白有鸟道,可以横绝峨眉巅' — 'westward by Mt. Taibai there is a bird-path that crosses straight over Emei's peaks.' The image: a track so narrow and high only a flying bird could pass.