How to create an open world landscape in Km²

Hello

I am fairly new to using UE5

I want to create a 70km² landscape / map for my open world game. Now I don’t even know how big the standard sizes in km² are that UE suggests.

For example
Scale: 100x100x100
Section size: 64x64
Section Per component: 2x2
Number of Components: 32x32
Overall Resolution: 4033x4033
Total Components: 1.024

Source:

Can someone tell me how I can calculate this or what I have to enter to get 70km²?