Longest Ski Runs in Europe: Vallées Blanche, France

Question
Where is the longest ski run in Europe please?

Answer
Dear Stuart --

In a good snow year, France's Vall閑 Blanche, has the world's, not just Europe's, longest lift-served ski run.  This run is skiable for 13 miles from the Aiguille du Midi's 12,604-foot summit to the outskirts of Chamonix, a resort some 9,200 vertical feet below. There are many places along this run with sheer drop-offs.  I was never so cautious skiing in my life, as I was there!

Best regards,