Sculpt
From the Inspector:
From the toolbar:
Sculpt is a suite of tools that alter the shape of the Terrain with additive and subtractive methods. Sculpt contains four tools:
Bridge creates a Brush stroke between two selected points to build a land bridge.
Clone duplicates Terrain from one region to another.
Noise uses different noise types and fractal types to modify Terrain height.
Terrace transforms Terrain into a series of flat areas like steps.