The main goal of this research was to elaborate a morphopedological map of the northern-central sector of the Araquá - Samambaia interfluve, in São Pedro. We also tried to correlate this map with data extracted from similar studies performed in neighboring interfluves, where three zones with different drainage density and related pedologic systems were identified: Broad Interfluves Zone, Transition Zone and Narrow Interfluves Zone (1:50.000).
Morphopedological compartmentation, based on hypsometric, gradient, morphological and pedological maps, allowed the recognition of seven compartments in the study area (1:25.000) and the comparison with the zones identified in neighboring interfluves.
One of the morphopedological compartments presents the highest altitudes (510 - 640 metres), the lowest gradients (0 - 6°), the lowest drainage density (2.6 Km/Km2) and the deepest soils along hillslopes in the study area and can be compared with Broad Interfluves Zone of the adjacent interfluves; two of them present lower altitudes (470 - 608 metres), higher gradients (6° - 20°), higher drainage density (4.0 - 4.3 Km/Km2), thick soils on the tops and shallow soils on hillslopes, corresponding to the Narrow Interfluves Zone outside the sample area; and two compartments present intermediate features of the previous ones, similar to the Transition Zone identified in the neighboring areas.
The two remaining morphopedological compartments show low to high gradients (0 - 20°), medium to high drainage density (3.9 - 7.5 Km./Km2) and predominance of shallow to medium-thickness soils. Similar features were not found on interfluves outside the area.