Pontine Marshes
an extensive marshy tract of land in Italy, in the S. part of the Roman Campagna, extending along the shores of the Mediterranean for about 24 miles, with a mean breadth of 7 miles. The Romans, by the construction of the Appian way and by means of canals, made a considerable part of them dry, and many of the Popes, especially Pope Pius VI., engaged in the drainage and reclaiming of the marshes.