The aim with this thesis has been to get a better understanding on how islands can affect the delimitation process. I have divided this presentation into two main parts. First I have concentrated on the definition of the islands and their right to possess maritime zones under the Law of the Sea Conventions. I have also choose to make a brief presentation of the artificial islands and take a look at their legal status. In the second main part I have examined the current dispute between Romania and Ukraine over the delimitation of their respective maritime boundaries and drawing a single maritime frontier.