Example of iMaps for Joomla
You can use CSS to remove inactive regions. This can be useful if you don't want to display surrounding countries or regions in your map.
Just add this css lines to the css file of your template
Replace ID with the id number of your map. For example #visualization-3. This css line will hide all the regions that has the color f5f5f5. This is the default color for inactive regions. If you change the color for inactive regions, you will have to change the color in this css lines.