The western basin includes the Alboran, Balearic, Ligurian and Tyrrhenian Seas, while the eastern basin includes the Ionian, Adriatic, Aegean and Icarian Seas.
There are also other areas of the Mediterranean Sea that are not included in the division. These are areas also called seas, such as the Sicilian, Thracian, Myrtean, Cretan, Cypriot, Levantine, and Libyan seas.