Three Gorges Museum large reliefs, and 1-km (1,094 yards) long "Ecological Corridor". The museum covers an area of 42,497 m (c. 50,828 square yards). The exhibition hall covers 23,225 m (c. 27,778 square yards). There are four main displays: Further displays include: Another major exhibit is a 180° panorama of wartime Chongqing when it was the provisional capital of Free China and was subjected to Japanese bombardment. There is also a 360° cinema showing the natural and social scenery of the Three Gorges before the dam was constructed. A 1st-floor exhibition on the Three Gorges includes a model of the Three Gorges Dam.
Three Gorges the river along vertical fractures, forming precipitous cliffs. When the river flows through areas of softer sandstone and shale, which have less resistance to erosion, the erosive effect is increased, carving wide valleys. There are different theories on how the Three Gorges were formed, but geographers and geologists have generally reached a consensus, believing mountain folding in the east of Sichuan Province and the west of Hubei Province, including the Wu Mountains (), were the outcome of the Yanshanian movement () around 70 million years ago. The gorges run from southwest to northeast, then turn, and from west to east,