Flowing through the dramatic landscapes of Argentine Patagonia, the Río Neuquén is the second most important river in Neuquén Province, surpassed only by the Río Limay. This wild river carves through ancient geological formations, including the striking red sandstones of the Candeleros Formation — rocks dating back 90 to 100 million years and famous for yielding dinosaur fossils, including Giganotosaurus carolinii. While not as internationally celebrated as some of Patagonia's more famous fisheries, the Río Neuquén offers a genuinely rewarding angling experience characterized by low fishing pressure, expansive stretches of public water, and fish that rarely see artificial presentations. With over 400 kilometers of accessible river corridor and very sparse surrounding populations, this is a destination for anglers seeking solitude alongside quality fishing in one of South America's most visually stunning environments.