Pumalín Park is a 3,250 km2 (1,255 sq mi) private nature reserve in the Palena Province of Chile, created by the United States environmental foundation The Conservation Land Trust, which is endowed and led by the American business magnate Douglas Tompkins. Designated a Nature Sanctuary in 2005, Pumalín is Chile's largest private nature reserve and is operated as a public-access park, with an extensive infrastructure of trails, campgrounds, and visitor centers.The park consists of two areas, and there seems to be some interest of the park owners to purchase the intermediate 340km² of the San Ignacio del Huinay Foundation as well. Opposed to this acquisition are mainly the about 30 inhabitants of the hamlet Huinay, located at the coast of the aimed area. The northern portion of the park borders Hornopirén National Park.
In 1991, Douglas Tompkins bought a large, semi-abandoned plot of land in the Reñihue River Valley of the Chilean province of Palena. A mountaineer and conservationist who had been visiting Patagonia since the early 1960s, Tompkins sought to protect the 16,996.6 ha (42,000 acres) tract, most of which was primeval Valdivian temperate rainforest, from future exploitation. After moving to Reñihué to live full-time, Tompkins began developing plans for a larger park, gradually acquiring additional adjacent properties from willing sellers. Ultimately, roughly 98 percent of the park acreage was bought from absentee landowners.