Mawarannahr

Transoxiana (also spelled Transoxania), known in Arabic sources as Mā warāʼ al-Nahr (Arabic: ما وراء النهر‎‎ Arabic pronunciation: [ˈmaː waˈraːʔ anˈnahr] – 'what [is] beyond the [Oxus] river') and in Persian as Farārūd (Persian: فرارود‎‎, Persian pronunciation: [fæɾɒːɾuːd]—'beyond the [Amudarya] river'), is the ancient name used for the portion of Central Asia corresponding approximately with modern-day Uzbekistan, Tajikistan, southern Kyrgyzstan, and southwest Kazakhstan. Geographically, it is the region between the Amu Darya (Ancient Greek: Ώξος Ốxos) and Syr Darya rivers. The area had been known to the Romans as Transoxania (Land beyond the Oxus), to the Arabs as Mawarannahr (Land Beyond the River), and to the Iranians as Turan, a term used in the Persian national epic Shahnameh.

The region was one of the satrapies of the Achaemenid dynasty of Persia under the name Sogdiana. Early Arab geographers named it "Bilād al-Turk" or "Turkestan," both of which mean 'the lands of the Turks'.

...
Wikipedia