Adria, a town of Italy, in the Venetian province of Rovigo, on the canale Bianco, between the mouths of the Adige and Po, 30 m. S. by W. of Venice; pop. 13,000. The inundation of these rivers gradually rendered the country uninhabitable, and their deposit of soil caused the sea to recede until the town, anciently a seaport, is now 14 m. inland. It is a bishop's see, and has a celebrated museum of Etruscan and Roman antiquities. The ruins of ancient Adria, or Hadria, founded by the Etruscans, lie S. of the modern town. The name of the Adriatic sea is derived from it.