or Araqua-Guazi, a river of South America, in Bolivia and the Plata Confederation, rises in the former country on the eastern slope of the Andes, near Chuquisaca, and flows S.E. through Bolivia and Plata, till it falls into the Paraguay nearly opposite Assumption; total length estimated at 1000 miles. It is navigable for boats nearly the whole of its length; but it is very shallow in the dry season, and where it is narrow the current runs with great force. The only city on its banks is Chuquisaca. Its chief affluents are the Pilaya and Pasapaya. About 150 miles from the Paraguay it divides itself into two arms, inclosing a marshy island.