Riacho Salto de la Vieja is a waterway located in the Chaco province of Argentina, stretching approximately 13.4 miles through the characteristic landscape of this subtropical region. The Chaco is known for its diverse aquatic environments, and this riacho — a term used in the region for a smaller watercourse or stream channel — winds through terrain typical of the Gran Chaco ecosystem, which features dense quebracho forests, wetlands, and a network of interconnected waterways. Boating on Argentine waterways is regulated nationally by the Prefectura Naval Argentina, which oversees recreational vessel registration, boat operator licensing (habilitación náutica), and navigation safety standards applicable to all waters in the country, including those in Chaco province.