Which feature on a map typically indicates populated areas?

The presence of a red line on a map is commonly associated with indicating populated areas, such as cities and towns. This convention helps users easily identify regions with significant development and infrastructure. Red lines often delineate boundaries of urban areas or major transportation routes, emphasizing human activity and population density.

The use of colors on maps is standardized, with various colors representing different features. For instance, blue is typically used for water features like rivers and lakes, while green often denotes forested or agricultural land. Yellow lines may represent less urbanized areas or agricultural lands, but they do not specifically signify populated zones. The red line's association with urbanization makes it an essential element for recognizing areas with high population concentrations.