I meant it might have 4 million tourists per year therefore fitting the clue, it's just not specifically known as a tourist destination like Bali. This UN source has Indonesia at a total of 13.4 million tourists in 2018, subtract four million, that's 9 million for the rest of the country, and I would guess most of that is in Java.
Cork is not the second biggest city in Ireland. Ireland is commonly used to describe the whole island. Belfast is the second biggest city on the island. Cork is the second biggest city in the ROI - you could amend the question to say "Republic of Ireland".
Hey QM, nice quiz, and this is no criticism. Only a small matter but that particular city was Capital of WEST Germany (or the Federal Republic of Germany) from 1945–1990.