The Yangtze River basin is located between 90.33 degrees East longitudes and 122.25 degrees East longitudes. The topography is: the western land is higher, the eastern land is lower. Exiting the Pacific Ocean, the climate of the Three Gorges (from Yichang to Chongqing) is without cold days in winter and hot days in summer. The average temperature is 28.2-centigrade degrees in summer, and 7 in winter. All the year round it is suitable for touring. The middle and lower reaches (from Yichang to Shanghai), the distinctions of spring, summer, autumn and winter are obvious. The winter and summer are longer compared with spring and autumn. The average temperature of summer is 28.8-centigrade degrees, and it’s 3 degrees in winter.