One-quarter of Paris-Charles de Gaulle Airport (France's main airport), but none of the terminals, are located on the territory of the commune of Roissy-en-France, which gave its original name to the airport. Later renamed Charles de Gaulle Airport, the airport is still commonly referred to as Roissy Airport in France. The rest of the airport lies on the territory of the commune of Tremblay-en-France and several other communes.
In the name Roissy-en-France, "France" does not refer to the country of France, but it refers to an area (pays) of the historical province called the Île de France, known as the pays de France. Île-de-France was made up of several pays: the pays de France, Parisis, Mantois, Hurepoix, and so on. Pays de France was the fertile plain located immediately north of the city of Paris, with the city of Saint-Denis at its centre. Pays de France is now almost entirely built-up, being covered by the northern suburbs of Paris. Pays de France is also known as the plaine de France ("plain of France"), and the name of this old pays still appears in the name of some communes in the northern suburbs of Paris, such as Roissy-en-France (which literally means "Roissy in the pays de France").
Roissy-en-France is served by no station of the Paris Métro, RER, or suburban rail network. The closest station to Roissy-en-France is Aéroport Charles de Gaulle 1 station on line B of the Paris Region's express suburban rail system, the RER. This station is located inside the airport, on the part of the airport belonging to the commune of Tremblay-en-France, 3 km (1.9 mi) from the town center of Roissy-en-France.