Trekking Laguna de Los Tres in El Chalten is a Patagonia bucket list adventure. The iconic views of Mount Fitz Roy towering high above Los Glaciares National Park make this one of the most popular hikes in Argentinian Patagonia if not all of South America! The hike up to Laguna de Los Tres starts in the town of El Chalten, climbs through a desert-like landscape overlooking a glacially carved valley where Las Vueltas River flows through, then climbs up into the rocky alpine. From the lake not only will you see Fitz Roy and surrounding peaks but also views of the Piedras Blancas Glacier.