Flowing out of the outlet of Lago Lolog, the Río Quilquihue is a lesser-known but highly rewarding trout stream tucked into the secluded valleys and meadows near Junín de los Andes and San Martín de los Andes in Neuquén Province, Patagonia, Argentina. This small, densely vegetated stream is a significant tributary of the legendary Río Chimehuin, which it joins after winding through the Patagonian steppe. The Quilquihue is celebrated for its crystal-clear waters, diverse aquatic insect life, and surprisingly high densities of quality trout. Despite its modest size, it punches well above its weight as a fishing destination, offering both technical dry fly challenges and highly productive stretches that reward patient, skilled anglers. Its remote, peaceful character and stunning Andean surroundings make it a standout experience in one of the world's premier trout fishing regions.