Terrassa is a city in central-eastern Catalonia. It is one of the two capitals of Vallès Occidental county, along with Sabadell. The name Terrassa derives from Latin Terracia, either from earlier Terracium castellum, or meaning "terrace", "area of flat land".It is the site of Roman Egara, a former Visigothic bishopric, which became a Latin Catholic titular see. Since 2004, it is again the see of a bishopric.