Also named Roissy Airport, CDG is the 2nd airport in Europe in terms of passenger traffic. From CDG, you can easily take the RER line B to Paris (30 minutes ride).
Orly was Paris' main airport before the construction of CDG. Today it serves mainly as the domestic hub, and for flights to cities in Europe, the Middle East, Africa, and the Caribbean.
You can ride the RER B from Orly to Paris but that's a little less convenient than from CDG . You can also ride a bus to the center of Paris.
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You will most likely arrive to Paris from either Charles-De-Gaulle Airport [1] or Orly Airport [2], which are conveniently connected to the city.
Here is a map of the suburban train network:
Paris districts or arrondissements are numbered in a clockwise way starting at the very center of Paris (Ile de la Cite).
The Seine splits Paris in two parts of roughly equal size, Rive Droite (right bank, north) and Rive Gauche (left bank, south).
The city of Paris itself is separated from the suburbs by a commuter belt, the Peripherique.
Main article: Paris_Rive_Droite
The right bank of Paris is home to some of the most famous streets and monuments of the world. Some examples are the Champs-Elysées, Montmartre or the Opéra.
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This area is named for the large central wholesale marketplace, which was demolished in 1971, to be replaced with an underground modern shopping precinct, the Forum des Halles.
Beneath this lies the underground station Chatelet-Les-Halles, central hub of Paris's express urban rail system, the RER.