Remove layer outline when touching background but not when touching other polygons?

Discussion created by wessles4 on Nov 26, 2013
Latest reply on Nov 27, 2013 by mark909
I'm currently working on a map of Southeast Asia, and the symbol outlines for all of the little island is making it look sloppy. I would remove it, but I still need the outline when there are adjacent countries to distinguish between them.

Is there any way within ArcGIS (or Adobe Illustrator or some other piece of software) to get rid of the outline when touching other polygons but not having it interact with the background? I know it is possible somehow because I've seen it (here is an example of what I'm talking about) but I just don't know how to do it.

Thanks in advance for any response, and I'm sorry if this is a repeated question or in the wrong place.