LANDSCAPE DISAPPEARS WHEN RENDER DEPENDING ON CAMERA DISTANCE

Hello,
I’m facing issues during landscape as single image export: when the camera is not so high from the landscape the scene renders properly.

When I increase the distance between camera and landscape (in order to obtain an overview of the entire scene) the rendering appears like water is spawned all over the landscap and not only where I created lakes.

The other actors seems are not working depending on camera distance. How can I pur the correct distances of the actors to be proper rendered?

Thank you all, best regards.
Roberto