Wetlands, leaf fodder trees and ancient grasslands: a characterization of the environmental heritage of transhumance. – For centuries, transhumance has been a socio-economic system capable of shaping mountain landscapes and environments. The paper presents two case studies aimed at identifying the historical-ecological traces of seasonal breeding systems to characterize the environmental legacy of transhumance. The proposed approach enables the evaluation of the positive externalities of past pastoral practices in terms of vegetation resources activation (leaf-fodder trees, ancient grasslands) and water resources maintaining (springs, ponds, small lakes, peat-bogs, etc.).