The Biosphere Reserve is located in the south of the state in the Balsas Basin. It comprises about 59,030 hectares of low deciduous forest, although in its highest parts there are oak and pine forests. 

Within the mountains there are 71 species of mammals, 208 birds, 53 reptiles, 18 amphibians, 44 butterflies and 14 fish species. However, what makes it unique is that it is the natural reserve with the most endemic species in one place. 71 especies de mamíferos, 208 de aves, 53 de reptiles, 18 de anfibios, 44 de mariposas y 14 especies de peces. Sin embargo, lo que la hace única es que es la reserve natural con más especies endémicas en un solo lugar.

In the town of El Limón there are some cabins, interpretive trails, a mine and a herpetarium. All this framed by the Cruz Pintada Dam where you can enjoy water activities.