, Nīrīz , the name of a mediaeval Islamic region and of a town of Fārs in southern Persia.

The Nayrīz plain is essentially a landlocked region in the southern Zagros mountains, drained by the Kūr and Pulwār rivers which rise in the Zagros and flow southeastwards into the shallow lake known in mediaeval Islamic times as the Lake of Nayrīz and in more recent ones as Lake Bak̲h̲tigān [q.v., and also E. Ehlers, art. Bak̲tagān Lake , in EIr ]; although the lake itself is salt, the plain forms an agriculturally prosperous region, and in ancient times was the heartland of Achaeme…