ABSTRACT This study delves into morphometric and morphotectonic analyses to unveil the evolutionary trajectory of Kerala's Korapuzha river basin. Employing advanced GIS and remote-sensing techniques, we explore the basin's geomorphological evolution and landform development. Our approach integrates data from a 1:50,000 scale toposheet and a 30 m resolution Digital Elevation Model (DEM), facilitating a detailed evaluation of basin characteristics. Through subdivision into KB-1 and KB-2 sub-basins, distinct morphometric patterns and morphotectonic features are discerned. The elongated basin configuration suggests ongoing tectonic activity, profoundly shaping its unique geomorphic evolution. To unravel tectonic influences, we employ morphometric indices, including the Relative Active Tectonic Index (IRAT), revealing neo-tectonic activity and dynamic landscape changes. Our study enriches our understanding of the Korapuzha river basin's evolution, illuminating the interplay between tectonic forces and geomorphic processes. Offering insights into tropical river systems, it contributes to broader landscape dynamic comprehension and informs sustainable land management practices. The IRAT calculation for the Korapuzha basin is based on the average of five geomorphic index classes, with resulting classifications indicating varying levels of tectonic activity. KB-1 and KB-2 sub-basins’ IRAT values enumerated as 2.2 and 2, respectively hence fall into classes 4 and 3, indicating low and moderate tectonic activity, respectively. The presence of tectonism in the study area revealed from geomorphic indices and IRAT, was acknowledged and evinced precisely by following the analysis of the SL index and GLA index method.