The Qinghai-Tibet Plateau is known as the 'Roof of the World'.
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脊 (jǐ) is also the word for spine/backbone — the ridge runs along the 'spine' of the roof. The set phrase 世界屋脊 (shìjiè wūjǐ, 'roof of the world') is the standard Chinese epithet for the Tibetan Plateau.
