This book is the core chapter of the newly revised version of "Mountain Dwelling Notes", "My Cultural Mountains and Rivers". It comprehensively describes the spatial significance of China's mountains and rivers from a macro perspective, which is extremely shocking to read. In this book, Professor Yu believes that Chinese culture has three largest lines between heaven and earth, which can also be said to be the basic latitude and longitude of Chinese culture. In order of importance, the first line is the Yellow River; the second line is the Yangtze River; and the third line is more complicated. To the north of the first two is the dividing line of 400 millimeters of rainfall, which is the line between heaven and earth that distinguishes agricultural civilization from nomadic civilization. His cultural investigation was mainly a long journey on these three lines between heaven and earth.
