After two flat days in the Tour de France, real mountains finally appear again. In no time, the race has moved from the center of France to the Vosges. The stage finishes in Belfort, which lies just outside the main mountain range.

The thirteenth stage covers a total of 205 kilometers, making it the longest stage in this Tour de France. It is also the only stage longer than 200 kilometers. Before any real climbing begins, the riders must cover roughly 150 kilometers northeast from the start in Dole.

The first climb comes only after 150 kilometers, over the Col des Croix (5.4 kilometers at 4.9%). No major casualties are expected here, but the next climb will likely make a difference.

The Tour revisits the Ballon d’Alsace (8.7 kilometers at 6.9%), which, 121 years ago, was the first real climb in Tour history—a moment that will surely be commemorated this Friday. The Ballon d’Alsace is a steady climb, but it still has a peak section of 8.8 percent along the way.

Afterward, a 30-kilometer descent toward Belfort follows. True daredevils may still try something here.