What color indicates boundaries on military maps?

The color that indicates boundaries on military maps is black. In military cartography, black is commonly used to represent various features including boundaries, roads, and other significant man-made structures. This use of black helps to provide a clear and easily recognizable distinction between the boundaries and other elements on the map.

The other colors mentioned have specific meanings in military maps: red is often used to denote danger areas or enemy positions, green represents vegetation or woodlands, and yellow can indicate areas of interest such as sand or desert terrain. Thus, knowing that black is the standard color for boundaries is crucial for accurately interpreting military maps during navigation and operational planning.