 It was changed several times to include or remove different cities in different moments of the history, in the years 1993, 2001, 2002, 2009, 2013 and 2018.The water supply plans of the region are coordinated, and transportation in the area is heavily interconnected with urban intermunicipal buses to all municipalities in the area, trains over the capital to some Baixada Fluminense municipalities, ferry boats to some of the Guanabara Bay municipalities and major inter-city freeways such as the Rio–Niterói Bridge, Red Line, President Dutra freeway and the Niterói-Manilha freeway ().Most transportation methods are integrated with the capital inner-transportation system of buses, trains, metro, freeways and expressways.