Introduction to Longmen Gorge: "Not Kuimen, but better than Kuimen" Longmen Gorge is only about 3 kilometers long. At the mouth of the gorge, two mountains confront each other, with sharp cliffs and a thin line of sky, which looks like a gate. The situation is very dangerous. On the boat, tourists can admire the towering peaks and strange rocks on both sides of the strait, flowing springs and waterfalls, monkeys, ancient hanging coffins, and the remains of ancient plank roads.