Pias is a Portuguese locality in the municipality of Ferreira do Zêzere, with an area of 5.43 km² and 456 inhabitants (2011)[1]. Density: 84 inhabitants/km².
It is 10m from the blue lake river.
It was a town and seat of a municipality until the beginning of the 19th century. The municipality consisted of the parishes of the seat, Areias and Chãos.[2] In 1801 it had 3520 inhabitants and 74 km².
It was the seat of a parish that was dissolved in 2013 as part of a national administrative reform, to form, together with Areias, a new parish called União das Freguesias de Areias e Pias with its headquarters in Areias; following this merger, it lost part of its original territory to the parishes of Águas Belas and Igreja Nova do Sobral.