, the name of a region lying to the west of Farg̲h̲āna [q.v.] in mediaeval Islamic Transoxania, now falling in the region where the eastern part of the Uzbekistan Republic, the northernmost part of the Tajikistan Republic and the easternmost part of the Kirghiz Republic meet.

The form Usrūs̲h̲ana is the best known, although Yāḳūt (i, 245) says that Us̲h̲rūsana is preferable. In the Persian versions of the text of al-Iṣṭak̲h̲rī and in the Persian text of the Ḥudūd al-ʿālam we find more often Surūs̲h̲ana, while Ibn K̲h̲urradād̲h̲bih sometimes has S̲h̲urūsana; the original fo…