Argentina is drained by a wide network of rivers that reflect its varied geography: the high Andes in the west, the broad pampas and Mesopotamia in the east, and the arid plateaus and lakes of Patagonia in the south. Rivers serve as natural borders, transportation corridors, sources of irrigation and hydroelectric power, and habitats for diverse aquatic and riparian ecosystems.

Major river systems

  • Paraná–Río de la Plata system: Includes the Paraná River and its tributaries such as the Paraguay and Iguazú; it flows toward the Río de la Plata estuary on the Atlantic coast.
  • Uruguay River: Runs along part of the border with Uruguay and joins the Paraná to form the Río de la Plata.
  • Paraguay–Pilcomayo–Bermejo: Northern tributaries connecting Argentina with Bolivia and Paraguay.
  • Andean rivers of the west: Rivers such as the Mendoza, Colorado and Neuquén originate in the Andes and are crucial for irrigation in arid provinces.
  • Patagonian rivers: Shorter, swift streams flowing from the southern Andes to the Atlantic, including the Chubut and Santa Cruz.

Regional patterns are marked: northern and northeastern rivers tend to be part of the Plata basin and are larger and more navigable, while western rivers descend steeply from the Andes and are tapped for irrigation and hydropower. Patagonian rivers are generally colder and carry glacial sediments.

Uses and importance include navigation on the Paraná and Uruguay for commerce, extensive irrigation networks in Mendoza and the pampas, and hydroelectric dams that supply significant portions of national and regional electricity. Rivers also support fisheries, wetlands and tourism—most famously the Iguazú Falls on a Paraná tributary.

Management of transboundary rivers requires international cooperation with neighboring countries over water sharing, flood control and environmental protection. Conservation efforts focus on wetland preservation and mitigating impacts from dams, pollution and agricultural runoff.

For a more detailed alphabetical index of Argentine rivers see complete list of rivers, and for country-level context see Argentina.