or Marosch, a river in the Austrian empire, rises in Transylvania, in Mount Magos, a branch of the Carpathians, flows through Transylvania in a S.W. and W. direction, enters Hungary, and forms the northern boundary of the Banat, till it enters the Theiss opposite to Szegedin after a course of about 350 miles. During the earlier part of its course it is inclosed among high cliffs, but further down it flows through a wide plain. The country which it washes on either side is rich in minerals; gold and silver being found to the north, and iron, lead, and copper to the south. Its principal affluents are,—on the right side, the Aranyos; and on the left, the Nyarad, Kokel, Sebes, and Strebl. The most important towns on its banks are Arad, Karlsburg, and Szaza; and it is navigable as far as Karlsburg.