Legacy Documentation: Version 2018.2 (Go to current version)
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Creating and editing Terrains
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Terrain Engine

Unity’s 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
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system allows you to add vast landscapes to your games. At runtime, terrain renderingThe process of drawing graphics to the screen (or to a render texture). By default, the main camera in Unity renders its view to the screen. More info
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is highly optimized for rendering efficiency while in the editor, a selection of tools is available to make terrains easy and quick to create. This section explains the various options available for terrains and how to make use of them.

See also the Knowledge Base Terrain section.