2. Any sea, or sheet of water, in which there are numerous islands; a group of islands.
3. A large group of islands; such as, the Philippine archipelago.
4. A sea, such as the Aegean, containing a large number of scattered islands.
2. A group of islands, or an area of sea containing a group of islands.
The islands of an archipelago are usually volcanic in origin, and they sometimes represent the tops of peaks in areas around continental margins flooded by the sea.
The Aegean Sea being full of island chains, the meaning was extended in Italian to "any sea studded with islands".
The Aegean archipelago lies between Greece and Turkey.