Río Las Conchas flows through one of the most visually dramatic landscapes in all of northwestern Argentina — the Quebrada de las Conchas, also known as the Quebrada de Cafayate. This roughly 75-kilometer canyon begins approximately 15 kilometers northeast of Cafayate, at the confluence of the Río Calchaquí and the Río Santa María, and extends southward to the area near the former Alemanía railroad station. National Route 68, connecting the provincial capital of Salta to the town of Cafayate some 190 kilometers away, runs the entire length of the quebrada, making the river unusually accessible for a canyon waterway. The surrounding geology is extraordinary — towering polychrome sandstone formations, eroded into spires, windows, and castellated ridges, frame the river corridor at every turn. Fishing here means casting in the shadow of some of the most striking rock scenery in South America.