How to understand "one side of the soil and water support one side of the people"

One side of the soil and water support one side. "Party" refers to a certain area; "Water and soil", including geographical location and phenological environment; A person is a person who has lived in this area for a long time. People in different regions have different cultural characteristics because of different environments, different lifestyles, different geographical climates, different ideas, different humanities and histories, and different ways of treating people.