Frozen Conurbations

Five cases where two cities sit close enough to share a labor market, an airshed, and a river basin, but operate as separate urban systems because of borders, walls, or missing bridges. Lahore and Amritsar were one Punjabi city for centuries before Partition severed them at the Wagah border in 1947. Nicosia and North Nicosia have been the only divided capital in Europe since 1974. Kinshasa and Brazzaville sit five kilometres apart across the Congo River and remain the only adjacent national capitals on Earth without a direct surface link. Detroit and Windsor share a regional economy that still moves a quarter of all US-Canada trade despite post-9/11 border friction. San Diego and Tijuana run a combined twenty-million-person labor market across one of the busiest borders in the world. The badge sits adjacent to the Conurbations and Twin Metros lenses but answers a different question: not which cities cluster, but which cities should cluster and do not.