Question on scaling?

Can some explain how the scaling works please as to 1 km to what this in the editor?

What landscape did you make? 127x127? 2x2?

also Landscape Technical Guide | Unreal Engine Documentation

Yes I think it was and also tried 63x63 2x2.
These hills at the peak should be about 840meters with the current flow you could say. Any other option and they are too vertical.

The area I would like to make is around 50x50km

Ok I have got it now, thanks uzumi =)
found this that explains it A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums