El Impenetrable

The Gran Chaco's interior — the vast hot dry forest known as El Impenetrable — is among the least-visited ecosystems in South America: quebracho trees with wood so dense it sinks in water, jaguars and giant anteaters in the undergrowth, and summer temperatures that pass 45 degrees. The national park carved from its heart protects the last intact central Chaco forest, with wildlife density measured among the continent's highest outside Amazonia.

Established in 2014 across some 130,000 hectares between major rivers, the park protects the full large-mammal cast the Chaco historically carried — tapirs, peccaries, maned wolves, pumas, giant anteaters returned by an active rewilding programme, and jaguars being brought back to breed where they once ruled. The quebracho colorado that dominates the canopy fed the tannin industry that deforested much of the Argentine Chaco last century; the park now holds the largest intact stands left. The visit runs on dry-season discipline: confirm the access road, campsite and any boat or guide before travelling, carry reserve water against the heat and isolation, and accept that conservation work never guarantees a particular animal. Ranger guidance and community-linked services soften the remoteness without erasing it — which is the point.