, a district and town of K̲h̲urāsān. The town (modern Turbat-i Ḥaydarī or Ḥaydariyya, see below) is some 140 km/88 miles south of Mas̲h̲had on the road to Gunābād and lies at an altitude of approximately 1,280/4,200 feet (lat. 35° 16’ N., long. 59° 08’ E.).

Al-Muḳaddasī, 319 n. a, describes it as being just a rural district with no town, but Yāḳūt, Buldān , ed. Beirut, iii, 128, names its ḳaṣaba as Ruk̲h̲k̲h̲ or Rīk̲h̲. In Il-K̲h̲ānid times, the town of Zāwa seems to have flourished, with 50 villages dependent on it, producing silk and fruits (Mustawfī, Nuzha , ed. Le Strange, 154, tr. 152; …