Zone 5 is the outermost concentric ring of the Paris public transportation (Île-de-France) network, representing the furthest reaches of the suburban and regional train lines. While Zones 1 and 2 cover the city center and the immediate surrounding neighborhoods, Zone 5 includes major international and regional hubs that are essential for tourists. The most famous destinations in Zone 5 are Disneyland Paris (Marne-la-Vallée/Chessy station) and Charles de Gaulle Airport (CDG). Additionally, historic sites like the Château de Fontainebleau fall into this zone. Traveling to Zone 5 requires a specific ticket or a "Navigo" pass that covers all five zones, as a standard "t+" metro ticket is not valid and can lead to heavy fines if you are caught by inspectors. The RER A and RER B lines are the primary arteries connecting central Paris to Zone 5. Navigating this zone is critical for travelers because it encompasses the entry and exit points for most international visitors, as well as the region's most popular "day trip" attractions located outside the Périphérique ring road.