群岛海
Because big part of the region is on the Archipelago Sea, there are several islands in the area and some of the municipalities are entirely on them, such as Rymättylä for example. In the city region of Turku are some of the most notable islands of the Archipelago Sea like Luonnonmaa in Naantali, Hirvensalo, Kakskerta and Ruissalo in Turku, and Kuusisto in Kaarina. Islands are not so populated excluding Hirvensalo in Turku which is really near the center. Most of them are covered by woods but near the mainland there are field areas.