Biggest European Cities that start with C on a Map

Can you guess every country in Europe based on its flag?

With the help of a map, try to name the cities of the world with an urban area population of at least 3 million.

Can you name every city in the world whose urban area has more than one million people - with the help of a map?

For each time zone, can you name the three biggest cities by urban population? When you guess the city, it will appear on the map.