The location is Calvinia in South Africa. The area is covered by a desert, but the day the crew arrived it started raining heavily. Yes, when an expensive film crew arrives in a desert where it never rains… It starts raining! After one day of waiting, the rain stopped and the desert dried in a couple of hours.
Here is a link to the movie (Apple QuickTime required):
Head over to www.john-andreas.com for more details. The commercial itself is currently aired at German television.
More info and movie clips over here.