The list consists of the 20 world cities that are at least 2400 km away from a larger city
Dot size depends on population
Dot colours: -blue represents a world capital -dark blue represents an agglomeration containing a world capital - purple represents a capital of an external territory
indeed it was! I am using a different source this time (see caveat - simplemaps.com) and I am trying to understand which one is more reliable. Previous source (citypopulation for 1 million cities and geonames or something for everything else) is rather time consuming for updates as you have to 'mix' the two, and citypopulation doesn't provide latitude and longitude. So if this one is good enough it's easier to use, but I don't know if it's good enough... thanks for your comment!