Fishing near San Francisco de Laishi, Formosa

San Francisco de Laishi sits in the Chaco region of Formosa province, in northeastern Argentina, surrounded by a dense network of rivers, riachos, and wetlands. The area is anchored by the Río Bermejo and Río Paraguay, with numerous tributaries and channels — including Riacho Formosa, Riacho Pilagá, and Arroyo Ramírez — threading through the landscape. Formosa is recognized across South America as prime catch-and-release territory, where large dorado, surubí, and pacú draw anglers to its slow, vegetation-lined waters.