Other contributors have said "What are some seas of Europe?" is the same question as "What are the three major seas of Europe?" If you believe that these are not asking the same thing and should be answered differently, click here
The Mediterranean Sea, the North Sea, the Irish Sea, the Gulf of Finland, the Baltic Sea, the Black Sea, the Balearic Sea, the Gulf of Lion, the Aegean Sea, the Ionian Sea, and the Adriatic Sea are...