`` Bactria '' was the Greek name for the area of `` Bactra '' ( modern Balkh ) , in what is now northern Afghanistan , and `` Margiana '' was the Greek name for the Persian satrapy of Margu , the capital of which was Merv , in modern-day southeastern Turkmenistan .
`` Bactria '' was the Greek name for the area of `` Bactra '' ( modern Balkh ) , in what is now northern Afghanistan . `` Margiana '' was the Greek name for the Persian satrapy of Margu , in today 's Turkmenistan .