There always a necessary to use parts of an image to link with different urls. Say for example, while clicking on the Maps, you can see different link on mouse over the map.
While clicking on the particular area you will be directed to the corresponding area detail and so on. This can be easily acheived by the HTML page using usemap tag.
But to implement the usemap in an article image, the editer will filter such tag, so cant do directly. A simple trick is to is disabling the editer for the partcular user or you can do by changing the global setting.