The chief cities and communities in the prefecture include Tripoli , Astros , Vytina , Dimitsana , Lagkadia , Leonidio , Leontari , Levidi , Megalopolis Paloumba and Stemnitsa . Ancient cities include Asea , Astros, Athinaio , Daseae , Falaisia (Phalesia), Gortys , Hypsus ( Stemnitsa , Irea , Lusi