The Paris train and bus transport system, RATP, has stopped selling the Carte Orange week pass / month pass and started selling the Passe Navigo Découverte, which is aimed at visitors and tourists to Paris.

For €5, the Passe Navigo Découverte card can be purchased on the spot at any metro ticket window in Paris, which can then be loaded with 2 to 6 zones of travel, for a week or a month. A 2 Zone Passe Navigo Découverte will cover Paris up to the financial center of La Défense on the western edge of Paris, home of the Grande Arche & Société Générale, to Chateau de Vincennes on the eastern edge of the city, home of the 12th century medieval keep.
A 6 Zone Passe Navigo Découverte is good for trains from Paris out to Chateau Fontainebleau, Chateau Versailles, Euro Disney, Airport Paris-Charles de Gaulle (CDG) Terminals 1 and 2 and Airport Paris-Orly (ORY).

Find out more about the Passe Navigo Découverte at Paris by Train.