add one from the UK: posted & discussed here a while back. while this came from the arabian peninsula, where i worked for ARAMCO Souther area projects dept. for 10+ years, i did not aquire it there. the rub' al kali was occasionally stomped across by me, in a 4x4 rather than by camel tho. and with quite a few gallons of h2o. i got stuck once, not a pleasant feeling at 50C+ with nothing but huge dunes in sight (pre cell (mobile) phone & satnav days too).
Ref:
http://www.vikingsword.com/vb/showth...light=musandam.