SketchUp provides everything you need to create your own terrain for your model using the Sandbox tools.Tip: The Sandbox tools are available as a toolbar you can add in View > Toolbars. The From Contours and From Scratch tools can also be found in Draw > Sandbox.Creating terrain can be useful when:

Geolocating a model or adding terrain puts your SketchUp design into real-world surroundings. By using SketchUp’s Add Location feature, importing data or site context, or creating your own terrain, you can enhance your model with specific and accurate location data and site context.