Evil aliens have decided to kill everyone in Europe! Fortunately, they've given you 45 seconds to save as many as you can. All you have to do is name a country to save everyone in it.
Sorry to say thay the longest river on the Iberian peninsula is river Tajo or Tagus, as you prefer. River Ebro is a little shortest (1007 km vs. 910 km)
I came to say this. I was sure that the way the question was asked, it was meant to be a small gimmick that both cities would work. While Frankfurt am Main is larger, both are commonly called by their name including their river to avoid confusion and since both satisfies an addition constraint (four letters) it should definitely count.
As a German, I also couldn't figure this out and tried every possible abbreviation of Nord-Ostsee-Kanal. However, according to Wikipedia, “Kiel Canal” does indeed appear to be the official English term.
At least 'Lea' is three letters so it's clear what Stratford the quiz is talking about.
Actually "Frankfurt" is technically the one on the Oder as the other is "Frankfurt am Main"
The clue is stretching it a little bit.