The mountains, forests, glacial lakes and pampas of Patagonia offer tremendous long-distance trekking opportunities. Both Chile and Argentina are represented here, as the treks sometimes meander over the border of these two countries. In addition, a number of trails in Chile’s national parks are part of the Sendero de Chile, a network of trails that spans the length of the country. Below are the best treks in both Chilean and Argentinian Patagonia.