The metropolitan population of Cardiff at 1 .1 million includes the population of Newport, 12 miles away 200 k .....Bridgend , 130 k .....18 miles away ....and much of the south wales valleys
Since when is Newport and Bridgend and Aberdare and Merthyr part of urban Cardiff ?
There is clearly a built up , continuous urban zone around Newcastle and Nottingham which makes them far bigger centres of population than Cardiff
The Cardiff urban area of around 450 k is clearly smaller than Newcastle at 823 k and Nottingham at 807 k
If you are going to use the metropolitan definition of Cardiff .....which includes 200000 people from Newport in its total ......ask them if they are from Cardiff ......then the large urban areas close to Nottingham have to be included , like Derby and Mansfield ......making Nottingham even bigger again
Metropolitan means the extent or influence of a city , the urban population is different and refers to the immediate built up areas where districts , suburbs and towns merge
Bridgend clearly isn't a part of urban Cardiff .....there are fields and meadows and cows for 18 miles between the settlements ......yet for administrative and cultural and employments it's part of if you wish .....greater Cardiff ?
But Nottingham and Newcastle have a big urban population surrounding them for several miles ....which is why they are seen as bigger cities than Cardiff even though their populations initially seem smaller
If you wander around Newcastle or Nottingham , visit the train stations , see the buildings it's obvious they serve a bigger population than Cardiff
Hope this explains things
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