An interactive 3D sand table is an advanced visualization tool that combines real-time terrain modeling with immersive digital projection to create a dynamic, hands-on experience. This innovative system allows users to shape and manipulate a physical sand surface while a depth-sensing camera and projection mapping technology instantly generate corresponding topographical features, such as mountains, valleys, and water bodies, in vivid colors. The sand table operates through a depth camera that scans the surface contours as users mold the sand. The system processes this data and projects realistic elevation maps, contour lines, and simulated water flow directly onto the sand. For example, pushing sand upward creates a "mountain" with shaded relief and elevation gradients, while digging a depression fills it with a virtual blue "lake" or "river" that responds to gravity. Users can interact with the environment in real time, observing how changes in terrain affect erosion, watersheds, or even simulated weather patterns. Beyond geography and geology, the sand table supports educational and strategic applications. In classrooms, it helps students visualize landforms, watershed dynamics, or historical battlefields. Urban planners and architects use it to model landscapes and test design concepts, while emergency responders simulate flood risks or disaster scenarios. The system can also integrate augmented reality (AR) layers, overlaying data like population density or infrastructure networks. The technology fosters collaborative exploration, as multiple users can reshape the terrain together. Its intuitive, tactile interface makes complex geospatial concepts accessible without requiring technical expertise. By blending physical interaction with digital augmentation, the 3D sand table transforms abstract data into a tangible, engaging experience—bridging the gap between creativity and scientific analysis. Whether for education, planning, or entertainment, it offers a versatile platform for understanding and interacting with 3D environments in real time.