ROSTOV, a fortified town of European Russia, in the government and 223 miles E.S.E. of Jekaterinoslav, on the Don, about 22 miles above its mouth, in the Sea of Azov. It contains the fortress of St Demetrius, five churches, two schools, and two benevolent institutions. Several manufactures are carried on here, as well as ship-building and fishery. Two annual and much-frequented fairs are held here, and there is an extensive trade. Pop. 12,587.