The National Maritime Park of Alonissos may not be exactly what you have in mind. It is actually a vast sea area of 2.200 square kilometers at the northeast part of Sporades which includes several islands, of which the only inhabited island is Alonissos. The purpose of the National Maritime Park is the protection of the rich fauna of this area which includes over 300 fish species, dolphins, whales, rare coral reefs, endangered bird species and of course the Mediterranean Seal Monachus Monachus.