The Los Alerces National Park is a national park in Chubut Province, Argentina, some 30 miles from Esquel. It is a park of 2,630 square kilometres along the border with Chile, best known for the alerce (lahuán) trees (Fitzroya cupressoides) from which the park takes its name.
The park was created in 1937 in order to protect the alerce forest, and other typical examples of the flora of the Patagonian Andes. The National Park has the largest alerce forest of Argentina. Alerce is one of the longest-living trees in the World; some in the park are around 3,000 years old, with many of them over 1,000 years. It grows very slowly and belongs to the family Cupressaceae. The principal forest in the park, visited by tourists, is at Puerto Sagrario at the northern end of Lago Menéndez. Arrayán (Luma apiculata) trees can be seen along the Arrayanes river.