The Serra da Farofa Complex is Klabin's biggest RPPN and the third largest in Southern Brazil, according to the Indicators Dashboard of the National RPPN Confederation. The complex has nearly 5,000 hectares of remaining tracts of Atlantic Forest, where you can find araucaria forests, highland fields and cloud forests. Additionally, the reserve contains the headwaters of the Caveiras and Canoas rivers, and harbors over 570 species of flora and 360 species of fauna based on observations. Since 2008, 39 research projects have been conducted in the area, which include 13 master’s projects, 10 doctoral projects, 6 undergraduate projects and 10 continuous monitoring projects. In 2019, at Nascentes Farm, the Nature Interpretation Center (CINAT) was inaugurated, a support center with a sustainable building for researchers and students. Reinforcing the ecological significance of the RPPN areas, in October 2021, Nascentes Farm received FSC® Certifications for Biodiversity Conservation (ES1), Carbon Sequestration and Storage (ES2), and Watershed Services (ES3). See the RPPN's Management Plan.

.Created in 1998, the Monte Alegre Farm RPPN has nearly 3,852 hectares dedicated exclusively to the conservation of natural resources in the municipality of Telêmaco Borba, in Paraná state. The Monte Alegre Farm RPPN has two predominant forest formations: Mixed Upper Montane Forest, also known as "Araucaria Forest," and the Semi-deciduous Seasonal Forest. In its management plan updated in 2022, 185 plant species were identified. Meanwhile, the survey and monitoring of fauna at the RPPN have registered a total of 316 species, of which 27 are mammals, 230 birds, 10 amphibians, 1 reptiles and 48 fish. In addition to harboring hundreds of species of fauna and flora, the area helps to maintain ecological corridors, protecting local biodiversity, and supporting scientific research. See the Forestry Public Summary.

Created in 1991, the RPPN Barra Mansa was incorporated by Klabin in 2024, as part of the acquisition of the forestry operation of Arauco, a Chilean company. In total, there are 218.05 hectares of land located in the municipality of Arapoti, Paraná. The region is predominantly composed of the Mixed Upper Montane Forest, also known as the 'Araucaria Forest', which is characteristic of the higher and more humid areas of southern Brazil. In the reserve, there are 43 species of mammals, 13 of which are endangered, and 312 species of birds, with 10 of them at risk. The flora comprises 61 distinct species, with 10 currently facing some level of threat.
In 2014, the area was identified as a High Conservation Value Area for Biodiversity by The Nature Conservancy.
 

The RPPN Vale do Corisco is situated along the Devonian escarpment, a geological formation that marks the transition between plateaus and contains rocks and fossils from the Devonian period, dating back 400 million years. The reserve, created in 1999, has 507.50 hectares, with 369.60 ha located in the municipality of Sengés, Paraná, and 137.90 ha in Itararé, in the state of São Paulo.
The region is characterized by predominant elements of Alluvial Mixed Upper Montane Forest, along with areas of Cerrado and Seasonal Semi-Deciduous Forest, which host 149 species of flora, 12 of which are endangered. In terms of fauna, the reserve is home to 29 species of mammals and 219 species of birds, with 13 mammal species and 10 bird species being endangered. The RPPN houses a national geotourism site: the Corisco waterfall, which features a drop of over 100 meters. In 2023, the FSC® certified that the region possesses a representative biodiversity across various groups of plants and animals, underscoring its crucial role in the conservation of native fauna and flora.

In 2025, Klabin increased the number of its natural reserves with the RPPN Samuel Klabin. Located in Imbaú, Paraná, the reserve has 168 hectares of areas formed by the Mixed Upper Montane Forest and Seasonal Semi-Deciduous Forest. The region is home to 267 species of flora, 100 of which are trees, notably fruit trees. Seven of these species are endangered. The fauna consists of 104 birds, 26 mammals, 10 amphibians and one reptile. This significant number underscores the importance of the conservation unit, which, despite being relatively small, is home to a notable diversity of animal and plant life.