The Río Porteño, also referred to as Riacho El Porteño, is a significant watercourse in the province of Formosa, Argentina. It flows from west to east for approximately 250 kilometers, eventually discharging its waters into the Riacho He Hé and the Río Paraguay. This river is a key resource for the agricultural and livestock development of the region. For paddlers, the waterway offers a multi-day expedition experience, with multi-day canoeing trips proposed in the area near the city of Formosa. These trips can be combined with visits to the nearby Bañado La Estrella wetland system. The river's character is defined by its role in the flat, humid litoral landscape of northern Argentina. Efforts to restore its flow have allowed the river to run through its entire channel. Boat ramps exist to support access, and the river is recognized for fishing. The overall vibe is one of a remote, working waterway integral to the local ecology and economy, suitable for paddlers seeking an extended journey through a distinctive South American environment.