Good quiz, although I'm not sure about the 'Tyrrhenian Sea' was formed by the caldera of a massive volcano that in fact just misses Corsica (France), and given the fact its still active, means there is still a chamber active underneath. I think that Italy should be the country.
To be fair, there is little question but that the Tyrrhenian Sea borders Corsica, an integral part of France. My beef is with the Levantine Sea. The western boundary of the Levantine Sea is nebulous, at best. Perhaps a better, more clear-cut, yet still relatively obscure sea might be the Sulu Sea or Bismarck Sea.
Funny how Tanzania is the correct answer for both lake Malawi and lake Victoria (in #1), but not for lake Tanganyika, which gave the country it's name.