The Ile-de-France region is divided into 5 transport zone. On Paris metro zone map Paris is in zone 1, Orly and Versailles in zone 4, Charles de Gaulle airport in zone 5. The Paris Metro operates exclusively in zone 1 and 2.
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Zones 1-3 allow you to travel within the city of Paris, i.e. within the limits marked in yellow on the map. With zones 4-5, you can travel throughout the Greater Paris region, and venture even further, to Disneyland Paris, for example, or to Versailles and its chateau, as well as to the Paris airports.