Tucked into the rugged sierra landscape of the Departamento Ayacucho in San Luis Province, the Río Luján and its associated Dique Luján offer a distinctive fishing destination set against a dramatic backdrop of steep hillsides and native vegetation. The reservoir, built in 1958 by damming the Río Luján, sits at a crown elevation of 687 meters above sea level and covers a surface area of 27 hectares with a total storage capacity of 3.6 cubic hectometers. The surrounding terrain is defined by the imposing Cerros Independencia and Bandera, and the water's edge is framed by native trees including molles, algarrobos, talas, and chañares — a landscape so wild that Andean condors are regularly spotted soaring overhead. The reservoir is located just 3.6 kilometers from the town of Luján and approximately 125 kilometers from the provincial capital, making it a reasonably accessible destination for anglers from across the region.