In each group, name any answer which matches the first category to reveal the second category, then name any answer which applies to both categories to reveal a third, and so on.
Ackchually... Paris being by a river doesn't mean it couldn't be above that elevation, rivers have varying elevations too and don't stay on sea level most of the time.
Same, I was stuck on that basis for a while too until I realised there were only a really small number of options that would work and something else must be going on. Suggest it would be clearer if the clue was worded Countries "and/or" Capitals of Europe.
In the first section (Countries of Europe), shouldn't Cyprus count? I know in this website, Cyprus is considered part of the Asian continent, but given that we are talking about the EU in here...
The Port of Amsterdam is located on the North Sea Canal, not by the sea.
UNBELIEVABLE
Got 100% with a bit of brain work and pausing but without Google Maps ;)
Helsinki longitude - 24.945 E
Warsaw longitude - 21.017 E
*It is a country/capital of Europe.
*It has 8+ letters. (11 total)
*It has a coast.
*It has an S in its name. (netherlandS)