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Why was the Qutang Gorge dangerous for navigation before the Three Gorges Dam was built?

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Locator map highlighting the course of the Yangtze River across China, with surrounding countries in East and Central Asia labeled, including India, Russia, Mongolia, Japan, and the Koreas. The Yangtze River is marked in blue and labeled in orange, showing its path from western to eastern China. An inset globe in the upper left shows the region's location within Asia.
Yangtze River

Before the construction of the Three Gorges Dam, the Qutang Gorge was considered the most dangerous section of the Yangtze River for navigation. Its primary hazards were its extremely narrow width and the presence of numerous rapids and eddies that made passage treacherous for vessels.1