Biggest European Cities that start with G on a Map

How many of the world's 50 most populous urban areas can you name?

Can you name the 45 urban agglomerations that have a population of at least 10 million using the empty map below?

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

With the help of a map, name as many of the world's 500 most populous urban areas as you can!