I Can't see the hole terrain... Why?

So… I have a really , really big map … 32756 X 32756 , and on the camera of First Person Controller , I have the Clipping Planes > Far with 35000 … But I cant see the end of the map … Can anyone help me?

What I see when I Play…

What I should see…

What you are seeing could be the manifestation of floating point imprecision. 35000 units is a very very huge camera range, probably too much.
You could try to set the near camera clip plane to a higher value, so the depth buffer is not stretched that much. Whats your near clip plane range at the moment?