Introduction
The Valdivian temperate rainforest stretches along the western slopes of the southern Andes in Chile and Argentina, from roughly 38°S to 48°S latitude. It is one of only a handful of temperate rainforest ecosystems in the Southern Hemisphere, and it harbors an extraordinary collection of ancient and endemic species isolated since the breakup of Gondwana.
Named after the city of Valdivia in southern Chile, this forest is characterized by its dense, multi-layered canopy of broadleaf evergreens, ancient conifers, and a profusion of mosses, ferns, and epiphytes that rival any tropical forest for lushness. The presence of alerce trees exceeding 3,600 years in age makes it one of the oldest living forests on Earth.
Geography & Extent
- Area: ~248,100 km²
- Countries: Chile, Argentina
- Latitude: 38°S to 48°S
- Climate Type: Temperate oceanic
The Valdivian rainforest occupies a narrow strip along the Chilean coast and western Andean slopes, rarely extending more than 200 kilometers inland. The Andes block moisture from reaching the eastern side, creating a sharp transition from lush rainforest to dry Patagonian steppe within a few dozen kilometers.
The forest spans a range of elevations from sea level to roughly 1,500 meters, with different forest types at different altitudes. Lowland forests feature broadleaf evergreens like coigüe and ulmo, while higher elevations support araucaria (monkey puzzle) and lenga beech forests that grade into alpine meadows.
Climate & Hydrology
- Annual Rainfall: 2,000-6,000 mm
- Average Temperature: 7-12°C
- Snow: Common at higher elevations in winter
The Valdivian rainforest receives heavy rainfall from moisture-laden westerly winds off the Pacific, with some coastal mountain areas exceeding 6,000 millimeters annually. Rain falls throughout the year, though winter (June-August) is typically wetter. The constant moisture supports a dense understory of bamboo (chusquea), ferns, and nalca (giant rhubarb).
The region's rivers and lakes are fed by both rainfall and glacial meltwater from the Andes. Lake District volcanoes, including the active Villarrica and Osorno, add geological drama to the landscape. Volcanic eruptions periodically devastate sections of forest, which then regenerate over centuries in a natural cycle of disturbance and renewal.
Biodiversity
- Tree Species: ~170
- Endemic Mammals: Monito del monte, pudu, kodkod
- Bird Species: ~200
- Ancient Lineages: Many Gondwanan relicts
The Valdivian forest is a refuge for Gondwanan lineages that date back to when South America, Antarctica, and Australia were connected. The monkey puzzle tree (Araucaria araucana) belongs to a family that dates back over 200 million years. The alerce (Fitzroya cupressoides) is the second-longest-lived tree species on Earth, with one individual dated to 3,622 years.
The pudu, the world's smallest deer at just 35 centimeters tall, inhabits the forest's dense undergrowth. The monito del monte, a tiny marsupial, is a living fossil — the sole surviving member of an ancient marsupial order otherwise known only from Australian fossils. The kodkod, South America's smallest wild cat, is found only in this forest ecosystem.
Threats & Conservation
- Main Threats: Logging, plantation forestry, fire, invasive species
- Forest Lost: ~50% of original extent
- Protected Areas: Several national parks and reserves
Roughly half of the original Valdivian rainforest has been lost to logging, conversion to exotic tree plantations (primarily eucalyptus and Monterey pine), and agricultural clearance. Chile's forestry subsidies have encouraged the replacement of native forest with fast-growing plantations, creating biological deserts where diverse rainforest once stood.
Conservation efforts include national parks such as Alerce Andino, Pumalín (now Pumalín Douglas Tompkins National Park), and Huilo-Huilo Biological Reserve. The late American philanthropist Douglas Tompkins and his wife Kristine purchased and donated hundreds of thousands of hectares of Valdivian forest to the Chilean and Argentine park systems, one of the largest private conservation donations in history.
Cultural Significance
- Indigenous Peoples: Mapuche
- Araucaria Nuts: Traditional Mapuche food source (piñones)
- Spiritual Connection: Trees and forests central to Mapuche cosmology
The Mapuche people have inhabited the Valdivian forest region for thousands of years and were the only indigenous group in the Americas to successfully resist Spanish colonial conquest for over 300 years. Their name means "people of the land," reflecting the deep connection between their culture and the forest landscape.
The monkey puzzle tree is sacred to the Mapuche, who harvest its large, nutritious seeds (piñones) as a staple food. Mapuche cosmology places the natural world at the center of spiritual life, with trees, rivers, and mountains considered living beings deserving of respect. Modern Mapuche communities continue to advocate for the protection of their ancestral forests against logging and plantation expansion.
Key Facts
- The Valdivian temperate rainforest is one of the few temperate rainforests in the Southern Hemisphere.
- Alerce trees in the forest have been dated to over 3,600 years, making them the second-longest-lived tree species on Earth.
- The monito del monte is a "living fossil" marsupial related to ancient Australian species.
- Roughly 50% of the original Valdivian forest has been lost to logging and plantations.
- Douglas Tompkins donated hundreds of thousands of hectares of this forest to Chile and Argentina for national parks.
Fun Facts
- The pudu, found in the Valdivian forest, is the world's smallest deer and stands just 35 centimeters at the shoulder.
- Monkey puzzle trees were alive when dinosaurs roamed the Earth — the family dates back over 200 million years.
- The Valdivian forest receives so much rain that some areas are wetter than any tropical rainforest.
- Charles Darwin explored the Valdivian forests during his voyage on the Beagle and was struck by their resemblance to tropical jungles.
Final Thoughts
The Valdivian temperate rainforest is a living link to the ancient supercontinent of Gondwana, harboring species and lineages found nowhere else on Earth. Its ancient alerce trees, tiny pudus, and fossil marsupials make it one of the most evolutionarily significant forests on the planet. The generous conservation donations by Douglas Tompkins and ongoing Mapuche advocacy offer hope for the long-term protection of this irreplaceable ecosystem.