Reserva Natural Formosa is a 9,005-hectare protected area in the Departamento Bermejo, southwestern Formosa province, traversed by Ruta Provincial 9.

The reserve sits along the Río Bermejo corridor, and the Mirador del Corte viewpoint along that highway overlooks the Madrejón del Corte, an abandoned channel of the river.

Two designated camping areas, Sacha Camping and Camping Guaipo, serve visitors within the reserve, along with a nursery of native plants.

Hikers can explore the Sendero Monte Adentro, which runs in two segments of 1,300 m and 2,000 m and includes a lookout over the riparian vegetation of the Río Teuco. A vehicular interpretive trail, Sendero Tewúk I-Chot, extends 5,500 m through the landscape.

A small resident community at Paraje El Potrerito, inside the reserve, raises livestock including cattle, goats, sheep, and pigs.