Rí⋅o /ˈrioʊ;Sp.ˈriɔ/Show Spelled Pronunciation[ree-oh;Sp.ree-aw]Show IPA, a river in N Argentina, flowing SE to the Paraná River. ab. 1200 mi. (1930 km) long.
also Salado del Nor·te (děl nôr'tě) A river of northern Argentina rising in the Andes and flowing about 2,011 km (1,250 mi) southeast to the Paraná River.
A river, about 1,368 km (850 mi) long, rising in western Argentina and flowing south-southeast to the Colorado River.