Rockall, is the capital city of the Atland. It is the country's largest and most populous city, with over 500,000 residents, while the population of its urban area is estimated to be more than 600,000. The Metropolitan area of Atland is estimated to have more than 1,000,000 inhabitants. In the borough of Northupbridge, there is the Rockall International Airport, Atland's busiest airport.