It has an area of 351.42 hectares (868.4 acres) and lies in the municipality of Alegrete in the state of Rio Grande do Sul.

It is the only area of full protection to preserve the native grasslands and riparian forest that are home to the black howler (Alouatta caraya).

The area is mostly covered by grass species, with a few espinilho (Vachellia caven) and aroeira-pretas (Myracrodruon urundeuva).

Riparian vegetation includes angico-vermelho (Anadenanthera colubrina ), camboim (Myrciaria delicatula), embira (Daphnopsis) and espinheira-santa (Maytenus ilicifolia).

A new rodent species has been found in the reserve, a tuco-tuco that forms underground galleries.