Which color on a military map indicates boundaries?

On a military map, the color that indicates boundaries is black. Black is typically used to represent man-made features, such as roads, buildings, and boundaries, including those of different units or territories. These boundaries can be critical for navigation and understanding the operational environment, as they define the limits of control and ownership.

While other colors have specific meanings—such as blue for water features, red for military operations or highlights, and yellow for built-up areas—black is standard for delineating boundaries. This clarity allows soldiers and navigators to quickly identify and interpret the terrain they are working in, especially in operational contexts where understanding unit areas of responsibility is essential.