The longest black piste in in the whole world is the Sarenne piste in Alpe d'Huez.
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 it says 16 km so the actual length is a bit unclear.
It can be noted that last part of the piste (which is several kilometers) after coming down to the bottom of the Sarenne gorge is more transport than black.
2.5 miles (4.0 kilometer) is the longest run in Utah.
400 meters
Vikersund, which has the record for world's longest jump.
Black on the piste map.
Bjørn Einar Romøren NOR 239 meters*
The longest black piste in Europe as well as in the whole world is the Sarenne piste in Alpe d'Huez. 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 it says 16 km so the actual length is a bit unclear. It can be noted that last part of the piste (which is several kilometers) after coming down to the bottom of the Sarenne gorge is more transport than black.
The alternate angle of depression is the angle of elevation and so 51/tan(6.7) = 434 ft which will be the length of the ski run providing the given information forms a right angle triangle.
Green, blue, red and black where green is easiest.
The hardest ski slope is often considered to be the Corbet's Couloir at Jackson Hole Mountain Resort in Wyoming, USA. It features a narrow entry, steep drop, and variable conditions, making it a challenging run for even expert skiers.
Then you first need to know which is the longest and that is a bit unclear. The second longest and it's location is one of the runs shown below. 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. Second longest in Europe also means second longest in the world.
ski's
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.