Kuimen, located at the entrance of Qutangxia, is the west gate of the Three Gorges of the Yangtze River, also known as Qutangguan, and the gateway to the Sichuan Basin under the majestic Baidi City. From Baidicheng to the east, it enters Qutangxia, the westernmost part of the Three Gorges of the Yangtze River, with a total length of about 8 kilometers, which is the shortest in the Three Gorges, but also the most majestic and steep. Du Fu said in a poem: "Bai Di is the Three Gorges Town, and Qutang is more than a hundred prisons. \"