Vallée Blanche in Chamonix, 22 km long.
The Sarenne run in Alpe d´huez is claimed to be the longest piste in the world, 16 km.
The longest ski run in the world is at Chamonix Mont-Blanc, France. Chamonix boast a 22 KM or 13.7 miles run called Vallee Blanche with a vertical drop of 2807 meters or 9209 feet all of which is served by a lift. NB: For the truly daring or adventurous, (and those willing to carry their skis to the top,) the run from the peak of Mont-Blanc to the base is approximately 18.5 miles. This might require a special permit from Italy or France.
Next answerer:There actually seems to be several candidates to this title:
1) Vallée Blanche in Chamonix from Aiguille du Midi down to Chamonix. There are several different numbers given for this run between 20 and 22 km. The Chamonix home page claims 20 km. Note that this is not a piste, it's a commonly used off-piste route where a mountain guide should be used.
2) From Kleine Matterhorn to Zermatt. Ski-zermatt claims 13 km and zermatt home page claims 22 km.
3) The Sarenne run in Alpe d'Huez is often claimed as the longest piste. It's on the piste map (from the Alpe d'Huez home page) stated as 19 km but on the Alpe d'Huez home page itself it says 16 km. It is probably the longest black piste, even though the last part of it is more transport than black.
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What is probably the four longest ski runs in the world is shown below. The order is however a bit unclear.
1) Vallée Blanche in Chamonix from Aiguille du Midi down to Chamonix. There are several different numbers given for this run between 20 and 22 km. The Chamonix home page claims 20 km. Note that this is not a piste, it's a commonly used off-piste route where a mountain guide should be used.
2) From Kleine Matterhorn to Zermatt. Ski-zermatt claims 13 km and zermatt home page claims 22 km.
3) The Sarenne run in Alpe d'Huez is often claimed as the longest piste. It's on the piste map (from the Alpe d'Huez home page) stated as 19 km but on the Alpe d'Huez home page itself it says 16 km so it's probably not the longest piste but it is the longest black piste, even though the last part of it is more transport than black.
There actually seems to be several candidates to this title:
1) Vallée Blanche in Chamonix from Aiguille du Midi down to Chamonix. There are several different numbers given for this run between 20 and 22 km. The Chamonix home page claims 20 km. Note that this is not a piste, it's a commonly used off-piste route where a mountain guide should be used.
2) From Kleine Matterhorn to Zermatt. Ski-zermatt claims 13 km and zermatt home page claims 22 km.
3) The Sarenne run in Alpe d'Huez is often claimed as the longest piste. It's on the piste map (from the Alpe d'Huez home page) stated as 19 km but on the Alpe d'Huez home page itself it says 16 km. It is probably the longest black piste, even though the last part of it is more transport than black.
the longest ski run in North America is right here in Canada matter affect it is in British Columbia which is Whistler.