The Paris Métro, short for Métropolitain, is a rapid transit system serving the Paris metropolitan area in France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architecture and historical entrances influenced by Art Nouveau. The system is 245.6 kilometres long, mostly underground. It has 320 stations of which 61 have transfers between lines. Operated by the Régie autonome des transports parisiens, it has sixteen lines, numbered 1 to 14, with two lines, Line 3bis and Line 7bis, named because they used to be part of Line 3 and Line 7, respectively. Three lines are automated. Lines are identified on maps by number and colour, with the direction of travel indicated by the terminus.