The borders of Belgium and Netherlands in Baarle-Narssau are also very complicated, you have dutch areas inside belgian areas which are in inside Netherlands, like a russian doll. Check the linkshttp://en.wikipedia.org/wiki/Baarle-Nassauhttp://goo.gl/maps/eDD2H Abusive comment hidden. (Show it anyway.)
http://en.wikipedia.org/wiki/Baarle-Nassau
http://goo.gl/maps/eDD2H