On the Overland menu, select Area Fills then click the area fill you want.
Move the mouse and click points.
Right click to close the shape.
Click more points to add another area fill, or right click to finish.
Note
To see a list of all drawing tools, click All Map Drawing Tools on the Overland menu.
The Body of Water properties override those you have currently set in the drawing.
Using area fills is not the most attractive way to add forests.