<![CDATA[Harau Valley is one of the distinctive geomorphological regions in West Sumatra, whose landscape development is controlled by the interaction of lithology, geological structures, and geomorphic processes. This study aims to analyze the relationship between geomorphology, lithology, and geological structures in reconstructing the geological processes responsible for the formation of the Harau Valley–Ngatanting Hills landscape. The research method involved field observations, including landform characterization, drainage pattern analysis, lithological identification, and measurements of geological structures such as faults, fractures, and striations. Geomorphological analysis was conducted using morphographic and morphometric approaches based on the Van Zuidam (1983) classification, while structural interpretation was carried out through the analysis of deformation features and structural orientations. The results indicate that the study area is dominated by structurally controlled landforms, including structural hills and structural valleys, characterized by dendritic drainage patterns and V-shaped valleys. The lithological units consist of phyllite, schist, and claystone of the Kuantan Formation, as well as breccia and conglomerate of the Brani Formation. Geological structures such as strike-slip faults, fractures, quartz veins, and striations play a significant role in controlling landscape development. The integration of geomorphological, lithological, and structural data suggests that the Harau Valley landscape evolved through the interaction of tectonic deformation, lithological resistance differences, weathering, and erosion processes.]]>
