Which color is NOT commonly found on a map?

The choice of yellow being the color that is not commonly found on a map is interesting. Typically, maps utilize various colors to represent different features: black is usually used for roads and borders, green represents vegetation and parks, and blue is often used to indicate bodies of water such as rivers and lakes.

In contrast, yellow is less frequently used on standard maps, particularly in topographical or physical maps. While it can appear in some contexts, such as to denote certain types of land use or areas of low vegetation (like deserts), it is not a primary or essential color like the others mentioned. Therefore, the selection of yellow as the option that is least commonly found aligns with the typical color-coding practices utilized in cartography. This choice reflects a broader understanding of the conventions used in map-making.