Pc Editor...terrain Creation

Hi, All
After fixing few issues with the editor...I can 'not find out...why the terrain shows up in the air...{see screenshot} Any tips would be greatly appreciated...Thanks

 

Just a guess, but that could represent the real-world elevation from sea level.

 

Ok, I try sea level at 0 and also at 300 No Change - when I right click on Landscape then click on Snap View to Object all get down together ...