The most complete geological map to date has just been published.
It serves to know well what kind of rocks there are in each of these areas that leave that typical image of the Moon with its shadows and lights. They have achieved this at the United States Geological Survey (USGS) in collaboration with NASA and the Lunar Planetary Institute, showing the geology of the moon in great detail.
Although our satellite is very visible, it is the first time that we have managed to have a map of these characteristics with this level of detail (scale 1:5,000,000). They have called it “Unified Geologic Map of the Moon” and the idea is that it will be the most detailed map of the lunar surface when planning future missions on the satellite.
We see in the explanation they have published that there are many colors, corresponding to the different types of formations. This may be surprising, given that if we do not have geological knowledge the Moon may seem to us to be something barren and without much variation on its surface.