Like so many reviews prior to this one,I concure, Mike Coronella is the most amazing guide! This fellow is a walking encyclopedia when it comes to the desert. The Fiery Furance is an amazing place and well worth a visit but the thing that made it so amazing was Mike and his in depth knowledge of the area. Not only is he very well versed in the geology of Arches but he knows so much about the flora, fauna and history of this place. When travelling the world these are the people that make such a difference to your appreciation and understanding of a place. Thanks Mike!