Ala-Shehr, a city of Turkey, in Asia Minor, in the eyalet of Aidin, at the N. E. base of the Boz Dagh (the ancient Mt. Tmolus), 75 m. E. by S. of Smyrna; pop. about 13,000, of whom 3,000 are Greeks. It is built on the site of ancient Philadelphia, is surrounded by a wall, and contains many ruins, including a large number of Christian churches. It is situated on the caravan route from Smyrna to the interior, and has a thriving trade.