Proyecto reserva natural y cultural provincial Tres Cerros, Natural and cultural reserve in La Cruz, Argentina

Proyecto Reserva Natural y Cultural Provincial Tres Cerros is a protected area in northeastern Argentina featuring three isolated peaks that rise about 179 meters above the surrounding grasslands. The landscape is shaped by native forests and diverse habitats that support the region's wildlife and plant communities.

The area preserves traces of Jesuit-Guarani missions established in the 1600s, including stone walls and cattle pens built during colonial times. These remains show how the land was settled and used for farming during that period.

The Guaraní name Ybití Mbohapí means 'three outcrops of the land' or 'three hills', the origin of the Spanish paraje Tres Cerros. The site lay within the estancia of the Jesuit reduction Nuestra Señora de Asunción de La Cruz, founded in 1630, and the road linking it to La Cruz was a route of occupation and cattle raising from the 17th century onward. A primary school, N° 765, stands in the paraje.

The site lies near La Cruz, in the General San Martín department, reached via the road linking La Cruz with the Tres Cerros area. The terrain is private estancia land with cattle activity, so access should be arranged in advance. Summers are hot and humid, with maxima near 42 °C; winters are mild, with occasional frosts down to -3.5 °C.

The Jesuit name for the area was Ybití Mbohapí, Guarani for 'three outcrops of the land' or 'three hills'. The same name and the road linking the hills with La Cruz made this a route of movement and cattle raising from the 17th century onward.