That is true for this report, based on the methodology https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/undesa_pd_2025_faq_wup

That is true for this report, based on the methodology https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/undesa_pd_2025_faq_wup25.pdf https://www.un.org/development/desa/pd/sites/www.un.org.deve... However, instead of an arbitrary administrative definition, they used an arbitrary cutoff for population density. Thus it still comes down to a subjective drawing of lines around the city.