Image from Flickr is by Zest-pk
Image from Wikimedia Commons is by Ian Restall
Image from Flickr is by miss goose
Image from Flickr is by SarahDepper
Image from Panoramio is by snorth
The original image from which above is cropped.
Image from Photobucket is by Noisette (View fully enlarged image).
View likely location in Google Earth Google Maps
A Google Earth Community member posh_tim in his post entitled "Angel's ArmChair" has placemarked it at -17.924854, 25.859109. Though as per about.com, the Angel's Armchair is not the real thing. It is a milder alternative to Devil's Pool, easier to get to and open from May to October.
Final update on location (May 18, 2010)