Upper and lower Antelope canyons on Navajoland just east of Page, Az. I used Velvia and used exposures from 8-30secs. What you are seeing is sandstone. There are other slot canyons( canyon X, Water Holes canyon, etc) in the same general area. I have been to Canyon X; I do not recommend it. I would like to try Water Holes but I believe you have to use ropes to get in which makes it hard to do. I have been shooting slots since 1997. Please be careful, check the weather forecast- if it going to rain, STAY OUT OF THE CANYONS- YOU WILL DIE. These rock formations are a result of flash floods.Gallery complete;( unless I find more "missing" slides)