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In page Sichuan:

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The rulers of the expansionist state of Qin, based in present-day Gansu and Shaanxi, were the first strategists to realize that the area's military importance matched its commercial and agricultural significance. The Sichuan basin is surrounded by the Hengduan Mountains to the west, the Qin Mountains to the north, and Yungui Plateau to the south. Since the Yangtze flows through the basin and then through the perilous Three Gorges to eastern and southern China, Sichuan was a staging area for amphibious military forces and a haven for political refugees.[citation needed]