Lake Covadonga provides a stunning setting for the hors categorie summit finish to stage 15.
After a rolling opening to the stage, the route then kicks up with a category-two climb and the day could be well-suited to a breakaway, in much the same way as the Monte Zoncalon proved at the Giro d’Italia.
If Alberto Contador has recovered from his injury, the Tinkoff-Saxo man will be one to watch having said he will be targeting stage wins in the final week.
However, regardless of Contador’s intentions, it is set to be a big day for all the GC men.
The final 12-kilometre ascent kicks up three times in all, with its average gradient of 7.2 per cent belying several ramps well in excess of ten per cent.
The final 200 metres are the steepest of the climb, a short, sharp wall with a 17.5 per cent gradient, where valuable seconds could well be accrued.