El Impenetrable National Park, National park in General Güemes Department, Argentina.
El Impenetrable National Park is a protected reserve in Chaco province that covers roughly 130,000 hectares of native forest between a highway and the Bermejo River. Dense vegetation and varied plant communities make up the landscape across this area.
The land was part of La Fidelidad estate until 2014, when Argentina established it as a national park. This designation aimed to protect the Chaco region's natural heritage for future generations.
The park's name comes from the dense, nearly impassable thorn forest that gave the region its reputation. Nearby settlements such as Las Hacheras and La Armonía, reached via Provincial Route 9, are the closest communities to the entrance. The former cattle ranch La Fidelidad left a herd of feral cattle that roamed the area until at least 2013.
Access is via Provincial Route 9; the nearest settlements are Las Hacheras and La Armonía. The park lies between the Bermejo and Bermejito rivers, so plan for heat above 40 °C in any month and rain concentrated from late spring to early autumn.
The park's origin lies in the 250,000-hectare Estancia La Fidelidad, a square roughly 50 km on each side. In the 1970s its owners released 3,000 cattle without internal fences; feral herds were still present in the area until 2013. The Bermejo River marks the park's eastern limit, separating it from the Formosa portion of the old estate.
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