On which sea are the Princes' Islands located?

Princes' Islands are islands in the Sea of Marmara on the Anatolian side of Istanbul. A group of ten islands and two small rock reefs. In the Byzantine times, they served as the place of exile of princes, priests and princesses. During the Ottoman Empire, members of the Sultan's family were sent here. In ancient times they were called Demonnesoi - People's Islands, in Byzantium - Papadanisia - Princes' Islands.