Ems, Or Ens(anc. Anisus, or Anesus), a river of Austria, rises in the province of Salzburg, on the northern slope of a branch of the Noric Alps, 12 m. S. of Radstadt, flows N. past that town, then E. N. E. through Styria, then N., partly separating the provinces of Upper and Lower Austria, and after a total course of about 120 m. enters the Danube 2 m. below the town of Enns. Its principal affluent is the Steier on the left. It is navigable to Ilie-felau, about 60 m., and its upper part lies amid wild mountain scenery. Its chief value is in its great water power. The archduchies of Upper and Lower Austria are often distinguished as Austria above the Enns and Austria below the Enns.
Ems, Or Ens, a town of Austria, on the left bank of the river Enns, a little above its junction with the Danube, 9 m. E. S. E. of Linz; pop. in 1869, 3,784. It has two churches and a handsome council house, and manufactories of iron, steel, and cotton goods. The walls of the town were built with the ransom money paid for Richard I. of England. Enns occupies the site of the Roman station Lauriacum, which was the scene of a cruel persecution of the Christians by Galerius in 304. A battle between the French and Austrians took place here Nov. 5, 1805. Near the town is the old castle of Ennseck, containing many Roman antiquities and belonging to the princes of Auers-perg.