Arroyo El Chañar is a stream flowing through Entre Ríos Province, Argentina, situated near the city of Crespo. Located at approximately 31°41′S, 59°47′W, this waterway is part of the rich network of arroyos and riachos that characterize the Entre Ríos landscape — a province defined by its intricate web of streams, wetlands, and river systems draining toward the Paraná and Uruguay river basins. Like many of the smaller waterways in this region, Arroyo El Chañar winds through agricultural and riparian terrain typical of the Mesopotamia region of Argentina, offering anglers access to the diverse native fish assemblages that thrive in the warm, productive waters of the Pampean and Mesopotamian lowlands.