With all the talk of Brexit, many commentators lazily talk of the UK leaving Europe, when it's actually leaving the EU. Which led us to consider what exactly Europe is - a quite important thing on which to be precise when one's setting quizzes!
Unlike the continents of North America, South America and Africa, Europe doesn't have a conveniently delimited land mass. The Eurasian landmass doesn't split neatly into two parts, and so an arbitrary convention has been adopted. The National Geographic Atlas of the World has a boundary "formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles."
The problem with this boundary is that it runs through five countries, leaving them in both Europe and Asia. From a quiz point of view are Russia, Turkey, Georgia, Azerbaijan and Kazakhstan in Europe or not? And then there are Cyprus and Armenia, which are completely outside this boundary definition of Europe, but are usually considered European.
We have tried to be precise with our use of Europe in our questions.