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It is a ridge merely for two tourists walking shoulder to shoulder leading to shorter distance. Shorter as it is, but it forms the division between climates of Sichuan basin and that of Qinghai-Tibet plateau where warm wave from basin and cold wave from plateau joins and draws a distinctive realm between Yin and Yang. YinMountain lies in northwest to road compared with YangMountain in southeast. Moreover, the clear day in south and cloudy day in north helps to divide two realms.