Concordia is a city in the Province of Entre Ríos, located on the banks of the Uruguay River.
About 10 Miles upstream, you reach the Hydroelectric Dam of Salto Grande, a binational entity (Argentino-Uruguaya). This great wall slows the migration of the Paraná river fish, which are called by their instinct to overcome the current of the rivers they inhabit, causing them to agglomerate in large quantities in the vicinity of the wall. This generates that in the area closest to and near the dam, the great Golden Dorados take over the territory and feed on smaller Golden Dorados, Bogas, Sábalos and other species that dare to pass. If the angler has the courage to throw his lure in this place,he will have the chance to get the world's largest Golden Dorado, where his weights range between 50 and 60 pounds of pure power. 
A fight with one of them will fulfill any Angler's dream if he manages to win the battle with those true river monsters.