1. What is the collective name for a group of frogs
2. Which ship sent the first SOS message
3. What is the national sport of Japan
4. Which organisation's anthem is 'Jerusalem'
5. Where is the Sea of Rainbows
2. Impossible to tell, but DEFINITELY not The Titanic. Most people say it was the SS Slavonia in the early 20th century, though it had been used by lighthouses before that...
The question is "Where is ...?", not "where can ... be found?" If it's the series of books, it could be almost anywhere. From what I can see, the title is allegorical, not geographic.