Hi Guys,
Thank you for your comments. The picture was taken during my recent trip to Sudety Mountains near the Poland/Czech Republic border in May. Those fellows were a fully equiped hiking company, while I've been having just a trekking trip.
And Claudio, yes, they were really looking like walking on a flat table. Check this link as well :)
//community.webshots.com/s/image15/7/99/12/164979912wKyFkH_ph.jpg
cheers,
michal.ski