Lago Embalse El Tunal is a reservoir located in the Metán department of Salta Province, in northwestern Argentina, positioned at approximately 25°15'S, 64°25'W. As one of the notable impoundments in the central-north Argentina region, El Tunal sits within a landscape characteristic of the subtropical lowlands of Salta, where warm temperatures and seasonal rainfall patterns shape both the aquatic environment and the behavior of its fish populations. The reservoir has been the subject of ichthyofaunal monitoring studies, confirming it as one of the more species-rich impoundments in the region, supporting a diverse community of native freshwater fish.