Medulinski bay is a shallow area, located between Cape Kamenjak and Cape Marlera, where the average depth does not exceed 20 metres. The peninsula Kašteja divides the bay into an outer and inner part, and the whole area includes a total of 9 islands and islets. This very complex habitat contains a wide range of habitat types. The inclusion of this area in the Natura 2000 network has emphasised the importance of the bay and its role in the entire ecosystem.
