CasteluCastelu is a commune in Constanța County, Northern Dobruja, Romania.The commune includes two villages: Castelu Nisipari Castelu is located in the central part of the county, along the Danube–Black Sea Canal.DemographicsAt the 2011 census, Castelu had 3,453 Romanians, 340 Roma , 509 Turks, 165 Tatars, 6 Aromanians, 7 others.