Lago Belgrano is a glacial lake covering approximately 42 km² within Perito Moreno National Park in the Río Chico Department of Santa Cruz Province, Patagonia, Argentina. It sits at coordinates 47°51'S, 72°09'W, enclosed by Andean cordilleras to the west and basaltic plateaus to the east. The lake is the principal body of water in the northern sector of the Río Mayer basin and drains westward into the Pacific Ocean — an unusual characteristic, as most lakes in Argentine Patagonia drain into the Atlantic.

The lake's most distinctive visual feature is its bright turquoise color, produced by glacially suspended particles carried by its inflow rivers, most notably the Río Lácteo, which originates from glaciers. This milky, glacial-blue appearance is a defining characteristic of the paddling environment.

The recommended season for visiting is October through March, corresponding to the Southern Hemisphere spring and summer. Patagonian weather in this region is notoriously variable and wind-prone, which is a significant consideration for paddlers on open water.

The park is accessible only by private vehicle. From Gobernador Gregores, the nearest significant town, the drive covers approximately 220 kilometers (3 to 4 hours) via Ruta Nacional 40 and the gravel Ruta Provincial 37. Visitors must register at the Onelli Visitor Center upon entering the park. The closest major airport is El Calafate International Airport, roughly 500 kilometers away.

The Península Belgrano trail system offers two loop routes — the Circuito Chico (9.6 km, moderate, 3–4 hours) and the Circuito Grande (16.8 km, high difficulty, 5–9 hours) — that traverse the peninsula's gently undulating terrain and provide views of the lake and surrounding peaks. Huts and tent sites are spaced along these trails. Cerro León, rising to approximately 1,500 meters, offers panoramic views of the lake from elevation. The park supports 120 bird species, including flamingos, geese, ducks, and condors; the Lagunas del Mié bird observatory is located about 8 kilometers from the Centro Operativo Onelli on the route toward the Mirador del Lago Belgrano.

Paddlers should confirm current access rules and launch procedures with park administration before launching, as regulations may apply.