We made into Zion Canyon yesterday. It is five miles deep and at the end another one mile hike to the narrows. That's where the canyon walls are only 30 feet wide and the Virgin River continues its sandstone cutting activity. This entire area is simply incredible. 200 million years of water eroding a high desert plateau combined with volcanoes and upward movement of the earth's crust. Human inhabitants trace back 12,000 years.
The canyon's of the great Colorado plateau includes Bryce to the north, Zion and the Grand Canyon to the south. These canyons will eventually wash away. Others will form. A constantly evolving geology influenced by the hands of Mother Nature.
Amazing never really knew what WA had. Sure want to visit now.