Water managing Qanats which likely emerged on the Iranian plateau and possibly also in the Arabian peninsula sometime in the early 1st millennium BC spread from there slowly west- and eastward.
wateR manAginG qanAtS wHich likelY emeRGed On the Iranian pLatEau anD PoSsibly alsO iN the arabIan PeniNsula sOMetime IN tHE eaRlY 1st MilLenniUm bc spREaD FroM theRE slowly wEst- AnD eastWarD.