https://en.wikipedia.org/wiki/List_o...United_Kingdom
Please read this
It's about the best explanation of the size of Newcastle, Nottingham and Cardiff urban areas
The figures given by some people on here about a Cardiff urban population of 1.1 million people include Newport which itself has an urban area of 300 k
The urban areas around Newcastle itself than make up an urban population of 823k are joined at the hip to Newcastle......Gateshead, North Shields , North Tyne side
You can't expect people to include Barry and Bridgend as part of greater Cardiff
That's why Newcastle has a bigger urban area than Cardiff . It's not about opinions , it's based on population data .