From Chilly to Champlan and back

Longjumeau (French pronunciation: ​[lɔ̃.ʒy.mo]) is a commune in the southern suburbs of Paris, France. It is located 18.2 km (11.3 mi) from the center of Paris.Inhabitants of Longjumeau are known as Longjumellois (French pronunciation: ​[lõʒymɛˈlwa]).

Champlan [ʃɑ̃plɑ̃] is a commune located 16 kilometres (10 mi) to the southwest of Paris, in the Essonne department in Île-de-France in northern France.Although now completely enveloped in the Paris Metropolitan Area, the town has conserved its rural character in spite of its direct proximity to the capital, and thus retains its slogan of "Champlan, the meadow of Paris".

Longjumeau Station is one of two station in Paris' express suburban rail system, the RER C, in the city of Longjumeau.