阿拉山口
Douglas Carruthers, who explored the area in the first decade of the 20th century, writes:The Dzungarian Gate is a defile about six miles wide at its narrowest point, and forty-six miles long, connecting Southern Siberia with Dzungaria. It forms a natural pathway from the plateau of Mongolia to the great plain of North-western Asia, and is the one and only gateway in the mountain-wall which stretches from Manchuria to Afghanistan, over a distance of three thousand miles. On the west, the Ala-tau drops suddenly from peaks above snow-line to the level of the floor of the depression, 700 feet above the level of the ocean,—the lowest altitude in the inland basins of Central Asia, with the exception of the Turfan depression, which is actually below sea-level.