Malaria remains a major public health challenge in Nigeria, particularly in rural and flood-prone communities where environmental conditions favor mosquito breeding and sustained transmission. Demsa Local Government Area of Adamawa State lies within the Benue River floodplain and experiences recurrent seasonal flooding, extensive wetlands, and high exposure to malaria risk. This study applies Geographic Information System techniques to map and analyze the spatial and temporal patterns of malaria incidence in Demsa Local Government Area between 2020 and 2025. Health records were analyzed using descriptive statistics, temporal trend assessment, spatial distribution mapping by wards, age-group analysis, and severity weighting to develop a malaria risk perspective. Results indicate a progressive increase in malaria cases over the study period, with pronounced seasonal peaks during the rainy and post-flood months. Spatial analysis reveals higher malaria burden in river-adjacent and flood-prone wards, while children under five years account for the largest proportion of reported cases. The study demonstrates the value of GIS-based malaria mapping as a decision-support tool for targeted intervention, resource allocation, and sustainable malaria control in Demsa Local Government Area.