The colors of different provinces and cities on the map of China are different, so what is the color based on?

Colors are random and there are no strict rules.

As long as the color coding of the map can meet the requirements of making the map elements clear and distinct, increasing readability, strengthening the function of information transmission and giving people a sense of beauty, there are no strict and fixed requirements for the colors of provinces and cities in China, and the commonly used colors such as brown, yellow, green and blue are more strict. The colors that are distinguished in.

Extended data:

The ocean is blue, the plains are green, the low hills are yellow, and the mountains and plateaus are brown and light purple to represent snow and glaciers.

Different shades of blue are painted between different isobaths, which can be used to indicate the depth of the seabed.

Between different contour lines, the thicker the green, the lower the terrain; The darker the brown, the higher the terrain; The area above the snow line is usually represented by white.