Lazikou is an important pass in the Lushan Mountains, a gateway to Gannan from northwest Sichuan, about 30 meters wide, surrounded by mountains and mountains, two cliffs between the cliffs of a narrow mountain valley stretching upward, and the cliffs on both sides stand. A river in the mountains, the river at the pass is a wooden bridge, across the steep walls on both sides of the bank, through the only way to Lazikou.