Here is KMZ file for Stage 18 Route Map with path/point/distance info.
Stage 18 - Thursday, July 21: Albi - Mende, 189 km
After the Pyrenees stages, the Tour goes over even another mountains - Massif Central in the middle of France. And this stage is for long escaper... in 1995, Laurent Jalabert won Stage12, after a long escape and climb over Côte de la Croix Neuve, finished in Mende - it was a memorable Bastille Day stage victory.