Petrés is a municipality in the comarca of Camp de Morvedre, in the Valencian Community of eastern Spain. It lies in the province of Valencia, within a comarca whose administrative centre is the coastal town of Sagunto.
The surrounding Camp de Morvedre district occupies the lower Palancia river valley and the coastal plain north of Valencia city. Petrés is one of several small inland municipalities in this comarca, situated close to the towns of Sagunto and Canet d'en Berenguer.
As a Valencian municipality, Petrés is governed by a local ayuntamiento under Spain's system of municipal administration, and forms part of the Valencian Community, one of Spain's seventeen autonomous communities. The area belongs to the traditionally Valencian-speaking zone of the region.