Highest point on map

[Lewik]

I want to build a straight-line base with mainbus with all items. https://satisfactory.gamepedia.com/World#Map_size
"The East-to-West border is measured 7456 meters (932 foundations)." I will give 8 foundations per item, so 100 item sections should be enough.

I want to make a flat line, I try to find the highest point on the map, but can't. Could you help me? It could be a screenshot, but better is Z coordinate.