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The Myrtoan Sea (also Mirtoan Sea; Greek: M ?, Myrtoo Pelagos [mir'to.o 'pela?os]) is a subdivision of the Mediterranean Sea that lies between the Cyclades and Peloponnese. It is described as the part of the Aegean Sea south of Euboea, Attica, and Argolis. Some of the water mass of the Black Sea reaches the Myrtoan Sea, via transport through the Aegean Sea (Saundry, Hogan & Baum 2011).
It is said to have been named after the mythical hero Myrtilus, who was thrown into this sea by an enraged Pelops. The name has also been connected with that of the maiden Myrto. It is also said to have derived its name from a small island named Myrtus.