About drawing on the map
You can use drawing tools to customize your map by adding your own labels and shapes. For instance, you can use the Highlight tool to draw a highlighted line on the map; use lines and arrows to indicate direction; add a text box to provide information about a place on the map; or use freeform shapes, circles, ovals, rectangles, and squares to call attention to places on the map.
After you have created your drawing, you can use the tools on the Drawing toolbar to change its color, size, or shape.