The geomorphic structure of Central cordillera in Antioquia departament of Colombia consists of a mosaic of first order landforms: uplifted etchplains, regional scarps, linear and branched canyons and the Aburra valley as an intramontane basin. Etchplains and regional scarps are spatially arranged as stepped patterns; lineal and branched canyons correspond to the youngest first order generation in the Colombian Central range and they are modelled simultaneously with the final Colombian north cordillera uplift. The Aburra valley is a unique type relief, not only on the northern of the Central cordillera but for all the Colombian Andes.The Santa Rosa de Osos etchplain is distinguished from the others stepped etchplains by the preservation of old (tertiary) relief types, relief elements, landforms and soils.