Around the world, floods are one of the most common disasters. A better understanding of flood hazards and vulnerability areas increases flood prevention and management effectiveness. It is estimated that nearly one fifth of flood-related deaths occur in India, and the recent floods in Kerala emphasize the need for updated risk maps. The purpose of this study is to create a flood risk assessment map for the Karuvannur river basin in Kerala, India by utilising 2018 and 2019 rainfall data to try and replicate the weather condition during floods as well as other available datasets. To create the risk map of the study area, GIS (geographic information system) is used along with AHP (Analytical Hierarchy Process) to combine vulnerability maps and hazard maps. Hazard maps were developed by pairwise comparison in the AHP process based on topographical and hydrological factors such as slope, drainage density, rainfall, etc., while vulnerability maps were generated based on elements such as population density, road network density, and land use. The resultant risk map showed higher risk areas in the central west and south east parts of the basin, and the newspaper reports corresponded to the same area.