Grand Couloir Courchevel, France
This is the widest and easiest of the infamous trio of Courchevel couloirs. The most difficult part is the path from the cable-car station at La Saulire. In icy conditions, you can't help wondering if your snowplough will end up doing an unscheduled ski jump into Sous Pylons or Emile Allais, the two more demanding descents.
The entrance between bands of rock is not particularly narrow, but it can be made so by the size of the moguls that form and dictate your route. If it hasn't snowed for a week or two, these moguls can be enormous and the first few turns become a question of survival rather than skiing. But the slope quickly widens and the second half can be glorious. Be warned: skiers on the main piste below can see how well you manage to ski it – or fall down it.