Thank you very much for the info. Yes, indeed, I have seen pictures of the canyon. Since tours are offered, and Antelope Canyon seems to be at least somewhat regulated and controlled, have there been any fatalities there from undetected flash floods?

With "hundreds and thousands" of visitors (their claim) there surely would be emergency incidents of all sorts....

Northern and Southern Arizona are quite distinctive and different regions with quite different land forms and topography and even climate.