Environmental geography and environmental geomorphology severally emphasize that unless loss of soil is checked, it would amount to a great loss for mankind. Present investigation was conducted to assess the present status of soil loss and sediment yield in the selected adjoining lateritic areas (Cainozoic upland of laterites) of Rampurhat I block, Birbhum district (West Bengal) and Shikaripara block, Dumka district (Jharkhand). The field study revealed that different forms of water erosion are operated there in varying magnitude. In particular rainsplash erosion, sheet and inter-rill erosion (overland flow), rill and gully erosion are considered here as major forms of water erosion. The soil series of Bhatina, Raspur, Jhinjharpur and Maldiha are shallow, light-textured and gravelly with very low moisture retention capacity, low pH and low amount of clay and organic matter. These soils (remained under barren waste land with sparse bushy vegetation) are susceptible to moderate-severe rain-splash, rill and gully erosion, and should be kept under thick vegetative cover and afforestation. To understand and prevent the soil erosion at first we should make some precise quantitative estimation of soil loss. In order that, taking small catchments and slope facets as ideal geomorphic unit, the present study is centrally focused on the charteristics of lateritic soil, the empirical quantification of soil loss and implementation of low-cost soil conservation measures.