The Raise or Lower TerrainThe landscape in your scene. A Terrain GameObject adds a large flat plane to your scene and you can use the Terrain’s Inspector window to create a detailed landscape. More info
See in Glossary tool is a good way to form the overall topography of your world. It’s the least specific of the sculpting tools, so you can use it to create large features that you later refine with the other tools, or with different brushes and settings for the Raise or Lower Terrain tool itself.
To raise or lower the terrain, in the Terrain tile’s Inspector window, select the Paint Terrain tool > tool dropdown > Raise or Lower Terrain.
The Raise or Lower Terrain tool is brush-based. To learn about working with brushes, refer to Brushes.
Although you can use large brushes to create a mountain quickly, you can get a more natural-looking mountain by building it up more slowly.
A workflow for creating a mountain might look like this:
This method of working from the general to the specific can create a better integration between different areas.