Claim: Vem cards are the smart card system for bus, train, and metro use in the Recife metropolitan area, the eighth largest metropolitan area in Brazil with a population of about four million people with an area of about 1,069 square miles.
Evidence: Recife (Brazilian Portuguese: [ʁeˈsifi (listen)) is the fifth-largest urban area in Brazil with 4,054,866 inhabitants, the largest urban area of the North/Northeast Regions, and the capital and largest city of the state of Pernambuco in the northeast corner of South America.