Introduction to the Three Gorges Fluctuation Zone: In order to allow rare plants unique to the Three Gorges, known as the "Plant Panda" - endangered plants such as sparse-flowered water cypress branches and lotus leaf maidenhair ferns, to settle down in Han, the Wuhan Botanical Garden invested more than 3 million A riverbank-like Three Gorges flood zone was built to simulate "high tide" and "low tide" in summer, autumn, winter and spring according to changes in the water level of the Yangtze River, allowing plants to "live" comfortably in the 70 cm water level drop.