The South American River solutions for the crossword are the AMAZON, Orinoco, Parana, Demerara, NEGRO, Plata, and Ica. The AMAZON is the largest river in the world by volume and runs through Brazil, Peru, Colombia, and Ecuador. The Orinoco is a major river in Venezuela and Colombia. The Parana is a major river in South America that runs through Brazil, Paraguay, and Argentina. The Demerara is a river in Guyana. The NEGRO is a major tributary of the AMAZON River. The Plata is a river in South America that runs through Argentina, Uruguay, Paraguay, and Brazil. The Ica is a river in Peru.