Game size? Solved

So i want to make the world be the size of skyrim aprox
In the landscape tool what would be the settings to created the desired world size

One unreal unit(uu) is equal to 1 cm. The whole of the skyrim map was about 5.5km by 5.5km (not really but close enough).
5.5km is 550000 cm or uu. Create a cube that is 550000 by 550000 to use as reference.

Add a landscape and fiddle with the settings until it is about the same size.

Hope that helps.