Go to the modify panel and set the parameters of Box as Length = 500, Width = 500 and Height = 20 so that it well-encompass the land surface. In the front viewport move the Box slightly to the down (i.e. in Y axis).
Now, in Top viewport again, create a Sphere primitive by clicking-dragging from the middle of the patch grid to the outward.
Set parameters of Sphere in the Modify panel as Radius = 300 and Hemisphere = 0.5. This will be our sky dome.
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