Les Halles
Châtelet is connected by another long underground corridor to the southern end of the RER platforms at Châtelet–Les Halles, the northern end of which is again connected to the Métro station Les Halles. The distance from Line 7 at Châtelet to the RER lines at Châtelet–Les Halles is approximately . It is the ninth-busiest station on the Métro system.