Yasuní National Park () is a protected area comprising roughly 10,000 km2 between the Napo and Curaray Rivers in Pastaza and Orellana Provinces within Amazonian Ecuador. The national park lies within the Napo moist forests ecoregion and is primarily rain forest. The park is about 250 km from Quito and was designated a UNESCO Biosphere Reserve along with the adjacent Waorani Ethnic Reserve in 1989. It is within the ancestral territory of the Huaorani indigenous people. Yasuní is also home to two uncontacted indigenous tribes, the Tagaeri and the Taromenane. Many indigenous people use the riverways within the park as a main mode of travel. Several waterways in the area are tributaries that lead into the Amazon River, including blackwater rivers high in tannins boasting vastly different floral composition than the main riverways. The spine-covered palm, Bactris riparia, and aquatic plant Montrichardia linifera typically line the edges of these slow moving rivers, often referred to as Igapós.
The park contains an estimated 1.7 billion barrels of crude oil – 40 percent of Ecuador's reserves. Plans to extract this oil were met with resistance from Indigenous people, and critisised by scientists. In 2007, president Rafael Correa launched the Yasuní-ITT Initiative in an effort to protect the park's natural resources. The initiative promised to protect the park's biodiversity in exchange for compensation from the international community, but the effort did not raise enough money. Oil extraction began in 2016 and was expanded in 2019.
In August 2023, a referendum on oil exploration in the national park passed, requiring a halt to oil drilling in the national park.
Biodiversity
Yasuní National Park (YNP) is arguably the most biologically diverse spot on Earth and a convergence point for three unique regions, the Equator, Andes Mountains, and the Amazon rainforest. The park is at the center of a small zone where amphibian, bird, mammal, and vascular plant diversity all reach their maximum levels within the western hemisphere. Moreover, the park breaks world records for local-scale (less than 100 km2) tree, amphibian, and bat species richness, and is one of the richest spots in the world for birds and mammals at local scales as well. The park also harbors a lot of amphibian diversity compared to other sites sampled in the western Amazon. Reptile species in the park are also very high in diversity with 121 documented species found. In spite of covering less than 0.15% of the Amazon Basin, Yasuní is home to approximately one-third of amphibian and reptile species. The park also harbors high levels of fish diversity with 382 known species. Yasuní is also home to at least 596 bird species which comprises one-third of the total native bird species for the Amazon. The park is also rich in species of bats. On a regional scale, the Amazon Basin has an estimated 117 bat species, but on a local scale, Yasuní is estimated to have comparable richness. In a single hectare, Yasuní has over 100,000 different species of insects which is roughly the amount of insect species that can be found in all of North America. The park also boasts one of the world's richest levels of vascular plants. It is one of nine places in the world that has over 4,000 vascular plant species per 10,000 km2. The park contains many species of trees and shrubs and holds at least four world records for documented tree and liana richness as well as three world records for diversity in woody plant species. The park also hosts a list endemic species such as 43 different species of vertebrates and 220–720 different plant species. Moreover, the park breaks world records for local-scale (less than 100 km2) tree, amphibian, and bat species richness, and is one of the richest spots in the world for birds and mammals at local scales as well. Within the northwest region of the park is a Forest Dynamics Plot, a 50 hectare research plot created in 1995 by a collaboration between Pontificia Universidad Católica de Ecuador (PUCE), the Aarhus University in Denmark, and ForestGEO-STRI.