Cabo Frio is a municipality in the State of Rio de Janeiro, located at 150 km/93 mi eastward from the city of Rio. Rio de Janeiro, commonly known as Rio, is the capital city of the Rio de Janeiro State, the second largest city of Brazil and the third largest metropolitan area in South America. Since July 2012, part of the city has been designated by UNESCO as a World Heritage Site in the category of ''cultural landscape''.