Lago Pehoé is a surface water body covering approximately 22 square kilometers (8.5 square miles), located within Torres del Paine National Park in the Magallanes Region of southern Chile, at coordinates 51°06′S 73°04′W. The lake is fed primarily by the Paine River, which carries water through Lago Nordenskjöld before entering Pehoé. It also receives outflow from Skottsberg Lake. The Paine River's upper reaches, including the Salto Grande waterfall, form part of the lake's broader watershed, an area that supports diverse flora and fauna, including wild guanaco.

The lake is navigable by boat, and a passenger ferry service operates on the water, with a crossing of roughly 35 minutes connecting to Pudeto. This boat service functions as a practical access point for hikers heading to various trails within the park, making the lake an important transit corridor as well as a destination in its own right.

The visual setting is defined by the dramatic backdrop of the Cuernos del Paine, the distinctive horned peaks that rise above the lake's shoreline and are frequently photographed from the water's edge. The combination of glacially influenced water, surrounding steppe and subpolar vegetation, and the proximity of major Patagonian peaks gives the lake a stark, open character typical of the region.

Torres del Paine National Park, in which the lake sits, is a managed protected area, and paddlers should anticipate that access and activities on the lake are subject to park regulations. The park is accessible from Puerto Natales and from Punta Arenas, both of which serve as common staging points for visits to the area. Given the park's location in Chilean Patagonia at roughly 51 degrees south latitude, weather conditions can be severe and highly variable, with strong winds being a consistent feature of the region. Paddlers planning a trip to Lago Pehoé should factor in the remote location, the potential for rapidly changing conditions, and the need to comply with any restrictions imposed by park administration.