Zavkhan Province
A 13th-century Mongolian source, "The Secret History of the Mongols", states that the Mongols called people from Central Asia, most notably Khwarazm, "Sartuul". "Sar" in Mongolian means "moon" so "sart" or "sarta" would mean "ones with (flag with) moon" since the Muslims had a crescent moon symbol on their flags. One of the Mongol tribes living in Zavkhan Province, Mongolia is made up of descendants of merchants from Khwarazm who resided in Kharkhorin and is still called Sartuul.