Land and Water Form "is a detachable and combinable terrain water teaching/display model used to visually present the forms, processes, and ecological functions of the interaction between land and water bodies. It is not only a classroom teaching tool for geography, biology, and environmental science in primary and secondary schools, but also a desktop sand table for rapid communication solutions in industries such as planning, landscape, and water conservancy. Complete the entire process of "slope runoff → valley → alluvial fan" in 30 seconds. Quantify the relationship between vegetation coverage, flow velocity, and erosion amount through sensors. Demonstrate the impact of the "raising foundation+flood detention area" plan on the submerged area within 10 minutes.