Pretty decent map. Obviously the territories in and around Helsinki are oddly shaped because of the many lakes and inlets. This makes it especially important that all connections be crystal clear. Unfortunately, they are not. Sometimes territories connect diagonally, but more often they do not. It is frequently unclear how island-containing territories, particularly those in Ullanlinna, connect to one another. Clean these up and the map will be 5-star.
Also, there appear to be broken connections between Siltasaari and both Kluuvi and Kruununhaka.