In the Netherlands we have a place called Utrecht, and a province (state) called Utrecht. Utrecht actually is the main city in Utrecht, but the first time I checked I found it all over the Netherlands. So believe me, if you look any further, you will find even stranger mistakes. :-). Some people don't do researh for a release, or just make a mistake selecting the state and: whoops, a new cityzone has been created.
You say the list of prefectures is not complete, can you provide a full list? States/prefectures can only be added by a few people on this website, and they don't always have time, but having a list of similar requests in different countries will help them to do that efficiently (and I know there is a similar request already). And over here we can then help to fill them with te right release spots after that.
(I think a full list of 200 Islands on state level is a bad idea. The list will be to long and cities can be found in multiple places).
I moved the cities listed above to Dodecannese, and added Rhodes to the names. You can check it here: http://www.bookcrossing.com/---/4061/
If you can think of a better solution for these cities let me know. If you want to suggest some other movements as well, please do in a new thread.